List of publications by László Székelyhidi
My old publications are scanned. Some pdf files are big and may download slowly. Please be patient.
- L. Székelyhidi, Characterization of Locally Compact Abelian Groups Having Spectral Synthesis, submitted
- L. Székelyhidi, Spectral Synthesis on Direct Products, arXiv:2308.10867 [math.FA]
- L. Székelyhidi, New Results on Spectral Synthesis, arXiv:2307.16016 [math.FA]
- L. Székelyhidi, Spectral synthesis on varieties, submitted, arXiv: 2306.17438 [math.FA]
- L. Székelyhidi, A generalization of the Heisenberg group, Jour. Iranian Math. Soc. (JIMS), 4(2), 105-119, 2023.
- Z. Fechner, E. Gselmann, and L. Székelyhidi, Endomorphisms and derivations of the measure algebra of commutative hypergroups, to appear in Indag. Math.
- Z. Fechner, E. Gselmann, and L. Székelyhidi, Generalized derivations and generalized exponential monomials on hypergroups, Opuscula Math. 43(4):493-505, 2023.
- L. Székelyhidi, Finite dimensional varieties over the Heisenberg group, Aequationes Math., 97(2):377–390, 2023.
- Z. Fechner, E. Gselmann, and L. Székelyhidi, Spectral synthesis via moment functions on hypergroups, Forum Math., 34(5):1187–1197, 2022.
- Z. Fechner, E. Gselmann, and L. Székelyhidi, Moment functions of higher rank on polynomial hypergroups, Adv. Oper. Theory, 7,41, 2022.
- Z. Fechner, E. Gselmann, and L. Székelyhidi, Moment functions and exponential monomials on commutative hypergroups, Aequationes Math., 95:1281–1290, 2021.
- E. Gselmann and L. Székelyhidi, Symmetric spectral synthesis, Aequationes Math., 95(2):255–279, 2021.
- Z. Fechner and L. Székelyhidi, Finite dimensional varieties on hypergroups, Aequationes Math., 95(3):551–567, 2021.
- L. Székelyhidi, S. M. Tabatabaie, and K. Vati, Strictly and strongly positive definite functions on locally compact hypergroups, Results Math., 76(3):156, 12, 2021.
- Fechner, E. Gselmann and L. Székelyhidi, Moment functions on groups., Results Math., 76(4):171, 16, 2021.
- L. Székelyhidi, Spectral analysis and synthesis on an infinite hypergroup join, Publ. Math. Debrecen, 99(3-4):261–273, 2021.
- Z. Fechner and L. Székelyhidi, Moment functions on double coset hypergroups, to appear in Results in Math.
- L. Székelyhidi, Spherical spectral synthesis on hypergroups, Acta Math. Hungar., 163(1):247–275, 2021.
- Z. Fechner and L. Székelyhidi, Finite dimensional varieties on hypergroups, Aequationes Math., 2021
- E. Gselmann and L. Székelyhidi, Symmetric spectral synthesis, Aequationes Math., 2021
- L. Székelyhidi, Note on the semi-simplicity of measure algebras, Monatsh. Math., 192:935–938, 2020.
- Z. Fechner and L. Székelyhidi, Remarks on infinite hypergroup joins, Ann. Univ. Sci. Budapest. Sect. Comput., 51:89–95, 2020.
- L. Székelyhidi, Laudation to Professor Antal Járai on his seventieth birthday, Ann. Univ. Sci. Budapest. Sect. Comput., 51:19–26, 2020.
- L. Székelyhidi, Invariant means in stability theory, In Ulam Type Stability, Springer International Publishing, Springer, Cham, 409–451, 2019.
- L. Székelyhidi, Spectral synthesis and partial differential equations, Acta Math. Hungar., 161(1):31–47, 2020.
- L. Székelyhidi, Spectral synthesis on the affine group of SU(n), Acta Math. Hungar., 158:352–362, 2019.
- L. Székelyhidi and K. Vati, Exponential monomials on hypergroup joins, Miskolc Math. Notes, 21(1):463–472, 2020.
- Fechner and L. Székelyhidi, Spherical and moment functions on the affine group of SU(n), Acta Math. Hungar., 157(1):10-26, 2019.
- Fechner and L. Székelyhidi, Moment Functions on Affine Groups, Results Math., vol. 74(1), Art. 5, 13 pp., 2019.
- Z. Fechner and L. Székelyhidi, Functional equations for exponential polynomials, Aequationes Math., Aequationes Math., 93(3):535-545, 2019.
- L. Székelyhidi and K. Vati, Moment functions on hypergroup joins, Adv. Pure Appl. Math., 10(3):215-220, 2019.
- L. Székelyhidi, Functional Equations on Affine Groups, Chapter 3, In Advanced topics in mathematical analysis, pages 71-94. CRC Press, Boca Raton, FL, 2019.
- L. Székelyhidi, S. M. Tabatabaie and B. Sadathosseyni, Convolution operators on measure algebras of KPC–hypergroups, Adv. Pure Appl. Math., vol. 10(1), pp. 1-6, 2019.
- L. Szekelyhidi and S. M. Tabatabaie, Invariant subspaces on KPC-hypergroups Zh. Mat. Fiz. Anal. Geom., 15(1):122-130, 2019.
- L. Székelyhidi, Spectral Synthesis and its Applications, Chapter 7 in Mathematical Analysis and Applications, Wiley, pp. 193-254, 2018.
- L. Székelyhidi, Superstability of functional equations related to spherical functions, Open Math., 15:427-432, 2017.
- L. Székelyhidi and B. Wilkens, Spectral synthesis and residually finite dimensional algebra, Jou. Algebra and its Appl., 16(10):1-10, 2017.
- L. Székelyhidi, Functional equations and stability problems on hypergroups, Chapter 14, Developments in Functional Equations and Related Topics, Springer Optimization and Its Applications 124, 2017
- Székelyhidi, Spherical monomials on affine groups, Ann. Univ. Sci. Budapest. Sect. Comput., 48:209-223, 2018.
- L. Székelyhidi, Continuation of the Laudation to Professor Zoltán Daróczy on his eightieth birthday, Ann. Univ. Sci. Budapest., Sect. Comp., vol.47, pp.9-18, 2018.
- L. Székelyhidi, Spherical monomials on affine groups, Ann. Univ. Sci. Budapest, Sect. Comp., vol. 48, 209-223, 2018.
- Székelyhidi, Spectral synthesis and Euclidean motions, Math. Pannon., 26(1):33-46, 2017/18.
- Székelyhidi, Functional Equations and Stability Problems on Hypergroups, in Developments in Functional Equations and Related Topics, Springer International Publishing, pp. 305-331, 2017.
- L. Székelyhidi and B. Wilkens, Spectral synthesis and residually finite dimensional algebras, Jour. of Algebra and Its Appl., vol. 16(10), pp. 1-10, 2017.
- L. Székelyhidi, Superstability of functional equations related to spherical functions, Open Math., vol. 15, pp. 427-432, 2017
- L. Szekelyhidi, On spectral synthesis in several variables, Adv. Operator Theory, vol. 2, pp. 179-191, 2017
- L. Szekelyhidi and K. Vati, Functional equations on hypergroup joins, Arch. Math. (Basel), vol. 109, no. 1, pp. 41-47, 2017
- L. Szekelyhidi, Invariant means on double coset spaces, Periodica Math., vol. 75, no. 1, pp. 58-65, 2017
- Z. Fechner and L. Székelyhidi, Functional equations on double coset hypergroups, Funct. Anal., vol. 8, pp. 411-423, 2017
- Z. Fechner and L. Székelyhidi, Sine and cosine equations on hypergroups, Banach J. Math. Anal., 2017, vol. 11(4), pp. 808-824, 2017.
- L. Szekelyhidi, Spherical spectral synthesis, Acta Math. Hung., pp. 111-117, 2016
- L. Szekelyhidi and L.Vajday, Spectral Synthesis on Commutative Hypergroups, Annales Univ. Sci. Budapest., Sect. Comp., vol. 45, pp. 111-117, 2016
- L. Szekelyhidi, On the principal ideal theorem and spectral synthesis on discrete Abelian groups, Acta Math. Hungar., vol. 150, no. 1, pp. 228-233, 2016
- Z. Fechner and L. Székelyhidi, Sine functions on hypergroups, Archiv. der Math., vol. 106, no. 4, pp. 371-382, 2016.
- L. Székelyhidi, On the powers of maximal ideals in the measure algebra, Banach J. Math. Anal., vol. 10, no. 2, pp. 385-399, 2016.
- J. M. Almira and L. Székelyhidi, Montel-type theorems for exponential polynomials, Demonstratio Math., vol. 49, no. 2, pp. 197-212, 2016.
- L. Székelyhidi, Remark on the graph of additive functions, Aequationes Math., vol. 90, no. 1., pp. 7-9, 2016.
- J. M. Almira and L. Székelyhidi, Characterization of Classes of Polynomial Functions, Med. J. Math., vol. 13, no 1, pp. 301-307, 2016.
- J. M. Almira and L. Székelyhidi, On the closure of translation-dilation invariant linear spaces of polynomials, Results in Math., vol. 69, pp. 263-272, 2016.
- Z. Fechner and L. Székelyhidi, A generalization of Gajda’s equation on commutative topological groups, Publ. Math. Debrecen, vol. 88, no. 1-2, pp. 163-176, 2016.
- L. Székelyhidi and B. Wilkens, Spectral analysis and synthesis on varieties, Jour. Math. Anal. App., vol. 433, pp. 1329-1332, 2016.
- L. Székelyhidi, Annihilator methods for spectral synthesis on locally compact Abelian groups, Monatsh. für Math., vol. 69, pp. 263-272, 2016.
- L. Székelyhidi, Spectral synthesis on special varieties, Annales Univ. Sci. Sectio. Comp., vol. 44, pp. 29-36, 2015.
- L. Székelyhidi, Stability of Functional Equations on Hypergroups, Aequationes Math., vol. 89, no. 6., pp. 1475-1483, 2015.
- L. Székelyhidi, A Functional Equation for Exponential Polynomials, Aequationes Math., vol. 89, no. 3, pp. 821-828, 2015.
- M. Almira and L. Székelyhidi, Local polynomials and the Montel theorem, Aequationes Math., vol. 89, no. 2, pp. 329-338, 2015.
- L. Székelyhidi, Annihilator methods in discrete spectral synthesis, Acta Math. Hung., vol. 143, no. 2, pp. 351-366, 2014.
- L. Székelyhidi, On Fréchet’s functional equation, Monatsh. für Math., vol. 175, no. 4, pp. 639-643, 2014.
- G. Horváth, L. Székelyhidi and B. Wilkens, Non-synthesizable varieties, Jour. Math. Anal. App., vol. 417, pp. 394–399, 2014.
- L. Székelyhidi, Characterization of exponential polynomials on hypergroups, Ann. Funct. Anal., vol. 5, no. 2, pp. 53–60, 2014.
- L.Székelyhidi, A characterization of exponential polynomials, Publ. Math. Debrecen, vol. 83, no. 4, pp. 757–771, 2013.
- Zs. Páles and L. Székelyhidi, Laudation to Zoltán Daróczy, Annales Univ. Sci. Budapest, Sect. Comp., vol. 40, pp. 9–20, 2013.
- L. Székelyhidi and L. Vajday, On Conditional Functional Equations with Applications on Hypergroups, Annales Univ. Sci. Budapest., Sect. Comp., vol. 41, pp. 323–332, 2013.
- L. Székelyhidi, Exponential polynomials on commutative hypergroups, Arch. Math., vol. 101, no. 4, pp. 341–347, 2013.
- L. Székelyhidi, The Levi-Civitá Equation, Vector Modules and Spectral Synthesis, Recent Developments in Functional Equations and Inequalities, Banach Center Publications, vol. 99, pp. 193–206, 2013.
- L. Székelyhidi, Spectral Synthesis Problems on Hypergroups, Annales Univ. Sci. Budapest., Sect. Comp., vol. 39, pp. 439–447, 2013.
- L. Székelyhidi, Spectral Analysis and Spectral Synthesis, in Nonlinear Analysis: Stability, Approximation, and Inequalities In Honor of Themistocles M. Rassias’ 60th Birthday (Panos Pardalos, Hari M. Srivastava, and P. Georgiev eds.), vol. 68, pp. 707–719, 2012.
- L. Székelyhidi and L. Vajday, Functional equations on the SU(2)-hypergroup, Math. Pannonica, vol. 23, no. 2, pp. 187–193, 2012.
- L. Székelyhidi and L. Vajday, Spectral Analysis and Moment Functions, Jour. Inf. Math. Sci., vol. 4, no. 2, pp. 185–188, 2012.
- L. Székelyhidi and L. Vajday, A moment problem on some types of hypergroups, Ann. Funct. Anal., vol. 3, no. 2, pp. 58–65, 2012.
- L. Székelyhidi, Polynomial Functions and Spectral Synthesis on Abelian Groups, Banach J. Math. Anal., vol. 6, no. 1, pp. 124–131, 2012.
- L. Székelyhidi, Noetherian Rings of Polynomial Functions on Abelian Groups, Aequationes Math., vol. 84, no. 1, pp. 41–50, 2012.
- L. Székelyhidi, Fourier transform for mean periodic functions, Annales Univ. Sci. Budapest, vol. 35, pp. 267–284, 2011.
- L. Székelyhidi and L. Vajday, Spectral analysis on commutative hyper-groups, Aequationes Math., vol. 80(1-2), pp. 223–226, 2010.
- L. Székelyhidi, Spectral synthesis problems on locally compact groups, Monats. Math., vol. 161(2), pp. 223–232, 2010.
- A. Orosz and L. Székelyhidi, Moment functions on Sturm–Liouville– hypergroups, Annales Univ. Sci Budapest, Sect. Comp., vol. 29, pp. 141– 156, 2008.
- L. Székelyhidi, D’Alembert’s Functional Equation on Compact Groups, Banach J. Math. Anal., vol. 1, No. 2, pp. 221–226, 2007.
- L. Székelyhidi, Superstability of moment functions on hypergroups, Nonlinear Funct. Anal. Appl., vol. 11, pp. 815–821, 2006.
- L. Székelyhidi, Spectral Synthesis on Multivariate Polynomial Hyper-groups, Monats. Math., vol. 153, pp. 145–152, 2008.
- M. Laczkovich and L. Székelyhidi, Spectral synthesis on discrete abelian groups, Math. Proc. Camb. Phil. Soc., vol. 143(01), pp. 103–120, 2007.
- L. Székelyhidi, Functional Equations on Sturm–Liouville Hypergroups, Math. Pannonica, vol. 17(2), pp. 169–182, 2006.
- S. Moslehian and L. Székelyhidi, Stability of ternary homomorphisms via generalized Jensen equation, Results in Math., vol. 49(3-4), pp. 289– 300, 2006.
- L. Székelyhidi, Discrete spectral synthesis, Ann. Math. Inform., vol. 32, pp. 141–152, 2005.
- M. S. Moslehian and L. Székelyhidi, Stability of ternary homomorphisms via generalized Jensen equation, http://arxiv.org/math., FA/0511540. (electronic) 2005.
- L. Székelyhidi, Polynomial functions and spectral synthesis, Aequationes Math., vol. 70(1–2), pp. 122–130, 2005.
- A. Orosz and L. Székelyhidi, Moment Functions on Polynomial Hyper-groups, Arch. Math., vol. 85, pp. 141–150, 2005.
- B. Ebanks and L. Székelyhidi, On multiplicative and additive differences, Aequationes Math., vol. 69, pp. 97–113, 2005.
- A. Bereczky, and L. Székelyhidi, Spectral synthesis on torsion groups, Jour. Math. Anal. Appl. vol. 304(2), pp. 607–613, 2005.
- L. Székelyhidi, Spectral synthesis and a characterization of polynomial ideals, Publ. Math. Debrecen vol. 66(1–2), pp. 183–195, 2005.
- L. Székelyhidi, Difference equations via spectral synthesis, Annales Univ. Sci. Budapest, Sect. Comp., vol. 24, pp. 3–14, 2004.
- A. Orosz and L. Székelyhidi, Moment Functions on Polynomial Hyper-groups in Several Variables, Publ. Math. Debrecen vol. 65(3–4), pp. 429– 438, 2004.
- Z. Páles and L. Székelyhidi, On approximate sandwich and decomposition theorems, Annales Univ. Sci. Budapest, Sect. Comp. vol. 23, pp. 59– 70, 2004.
- L. Székelyhidi, Spectral Analysis and Spectral Synthesis on Polynomial Hypergroups, Monatshefte Math. vol. 141(1), pp. 33–43, 2004.
- L. Székelyhidi, The failure of spectral synthesis on some types of discrete Abelian groups, Jour. Math. Anal. Appl. vol. 291, pp. 757–763, 2004.
- P. K. Sahoo and L. Székelyhidi, On the general solution of a functional equation on ZxZ, Arch. Math., vol. 81, pp. 233–239, 2003.
- J. K. Chung, P. Sahoo and L. Székelyhidi, On quadratic differences that depend on the product of arguments – revisited, Aequationes Math., vol. 67, pp. 216–224, 2004.
- L. Székelyhidi, Functional Equations on Hypergroups, in Functional Equations, Inequalities and Applications (Th. M. Rassias, ed.), pp. 167– 181, Kluwer Academic Publishers, 2003.
- L. Székelyhidi, On a Paper of T. M. K. Davison, Annales Acad. Paedag. Cracov., Studia Mathematica, vol. 13, pp. 55–62, 2002.
- L. Székelyhidi, The Octahedron and Cube Functional Equations Revisited, Publ. Math. Debrecen, vol. 61(3–4), pp. 241–252, 2002.
- P. Sahoo and L. Székelyhidi, A Functional Equation on ZnxYm, Acta Math. Hung., vol. 94(1–2), pp. 93–98, 2002.
- L. Székelyhidi, On discrete spectral synthesis, in Functional Equations – Results and Advances (Z. Daróczy and Z. Páles, eds.), pp. 263–274, Boston, Dordrecht, London: Kluwer Academic Publishers, 2002.
- P. Sahoo and L. Székelyhidi, On a Functional Equation Related to Digital Filtering, Aequationes Math., vol. 62, pp. 280–285, 2001.
- L. Székelyhidi, A Wiener Tauberian theorem on discrete abelian torsion groups, Annales Acad. Paedag. Cracov., Studia Mathematica I., vol. 4, pp. 147–150, 2001.
- L. Székelyhidi, Convolution–type functional equations, (in Hungarian) in Közgyűlési Előadások, pp. 451–456, Hungarian Academy of Sciences, May, 2000.
- L. Székelyhidi, Ulam’s problem, Hyers’s solution -and to where they led, in Stability of functional equations (T. M. Rassias, ed.), pp. 259–285, Boston, Dordrecht, London: Kluwer Academic Publishers, 2000.
- L. Székelyhidi, On the extension of exponential polynomials, Math. Bohemica, vol. 125(3), pp. 365–370, 2000.
- L. Székelyhidi, On a wave–type functional equation, in Advances in Equations and Inequalities (J. M. Rassias, ed.), pp. 219–224, Palm Harbor, USA: Hadronic Press, 1999.
- L. Székelyhidi, On convolution type functional equations, Math. Pannonica, vol. 10(2), pp. 271–275, 1999.
- L. Székelyhidi, On mean periodic functions, Aequationes Math., vol. 58(3), pp. 203–213, 1999.
- R. Badora, Z. Páles, and L. Székelyhidi, Monomial Selections of Set-valued Mappings, Aequationes Math., vol. 58(1–2), pp. 214–222, 1999.
- L. Székelyhidi, Laudation for Zoltán Daróczy, in Leaflets in Mathematics (Pécs, Hungary) (Z. Páles, ed.), Pécs, Hungary: Janus Pannonius University, 1998.
- L. Székelyhidi, On common eigenfunctions of difference operators, Publ. Math. Debrecen, vol. 52(3–4), pp. 699–704, 1998.
- L. Székelyhidi, Cosine operator functions on inner product spaces, in Inner product spaces and applications (Harlow), Pitman Research Notes in Mathematics Series, pp. 266–269, Harlow: Longman, 1997.
- L. Székelyhidi, On a characterization of linear operators, Acta Math. Hungar., vol. 71(4), pp. 293–295, 1996.
- A. Járai and L. Székelyhidi, Regularization and general methods in the theory of functional equations, Aequationes Math., vol. 52(1–2), pp. 10– 29, 1996.
- L. Székelyhidi, Functional equations via spectral synthesis, in Leaflets in Mathematics, Pécs, Hungary: Janus Pannonius University, 1995.
- L. Székelyhidi, Stability problems of functional equations in several variables, Publ. Math. Debrecen, vol. 47(1–2), pp. 95–100, 1995.
- L. Székelyhidi, On a characterization of linear operators, in Stability of mappings of Hyers-Ulam type (Palm Harbor, FL) (T. M. Rassias and J. Tabor, eds.), pp. 153–156, Palm Harbor, FL, USA: Hadronic Press, 1994.
- L. Székelyhidi, The stability of homogeneous functions, J. Univ. Kuwait Sci., vol. 20, pp. 159–164, 1993.
- L. Székelyhidi, Mean value-type functional equations, Aequationes Math., vol. 42(1), pp. 23–36, 1991.
- L. Székelyhidi, Summing power series with exponential polynomial coefficients, Publ. Math. Debrecen, vol. 38(3–4), pp. 245–246, 1991.
- L. Székelyhidi, The stability of the sine and cosine equations, Proc. Amer. Math. Soc., vol. 110(1), pp. 109–115, 1990.
- L. Székelyhidi, Stability properties of functional equations describing the scientific laws, Jour. Math. Anal. Appl., vol. 150(1), pp. 151–158, 1990.
- L. Székelyhidi, An abstract superstability theorem, Abh. Math. Sem. Univ. Hamburg, vol. 59, pp. 81–83, 1989.
- L. Székelyhidi, On a problem of S.Mazur, Trans. Amer. Math. Soc., vol. 316(1), pp. 161–164, 1989.
- L. Székelyhidi, Note on polynomial mappings, Publ. Math. Debrecen, vol. 36, pp. 263–265, 1989.
- L. Székelyhidi, On a linear functional equation, Aequationes Math., vol. 38, pp. 73–85, 1989.
- L. Székelyhidi, On the Levi–Civitá functional equation, Forschungszentrum Graz, Mathematisch–Statistische Sektion, Graz, vol. 301, 1988.
- L. Székelyhidi, Stability of some functional equations in economics, Rend. Sem. Mat. Fis. Milano, vol. 58, pp. 169–176, 1988.
- L. Székelyhidi, Fréchet equation and Hyers’s theorem on noncommutative semigroups, Ann. Polon. Math., vol. 448, pp. 183–189, 1988.
- G. Maksa, G. Szabó, and L. Székelyhidi, Equations arising from the theory of orthogonally additive and quadratic functions, C. R. Math. Rep. Acad. Sci. Canada, vol. 10(6), pp. 295–300, 1988.
- L. Székelyhidi, On addition theorems, C. R. Math. Rep. Acad. Sci. Canada, vol. 9(3), pp. 139–141, 1987.
- L. Székelyhidi, Remarks on Hyers’s theorem, Publ. Math. Debrecen, vol. 34(1–2), pp. 131–135, 1987.
- L. Székelyhidi, Lp-approximation by splines, Ann. Univ. Sci. Budapest, Sect. Comp., vol. 7, pp. 33–40, 1987.
- L. Székelyhidi, The Fourier transform of mean periodic functions, Util. Math., vol. 29, pp. 43–48, 1986.
- L. Székelyhidi, Note on Hyers’s theorem, C. R. Math. Rep. Acad. Sci. Canada, vol. 8(2), pp. 127–129, 1986.
- L. Székelyhidi, The Fourier transform of exponential polynomials, Publ. Math. Debrecen, vol. 33(1–2), pp. 13–20, 1986.
- L. Székelyhidi, Exponential polynomials and differential equations, Publ. Math. Debrecen, vol. 32, pp. 105–109, 1985.
- L. Székelyhidi, A characterization of trigonometric polynomials, C. R. Math. Rep. Acad. Sci. Canada, vol. 7(5), pp. 315–320, 1985.
- L. Székelyhidi, Regularity properties of exponential polynomials on groups, Acta Math. Acad. Sci. Hung., vol. 45(1–2), pp. 21–26, 1985.
- L. Székelyhidi, Regularity properties of polynomials on groups, Acta Math. Acad. Sci. Hung., vol. 45(1–2), pp. 15–19, 1985.
- L. Székelyhidi, Lp-approximation by splines, in Constructive Theory of Functions ’84, pp. 853–859, 1984.
- L. Székelyhidi, Local polynomials and functional equations, Publ. Math. Debrecen, vol. 30, pp. 283–290, 1983.
- L. Székelyhidi, Almost periodicity and functional equations, Aequationes Math., vol. 26, pp. 163–175, 1983.
- L. Székelyhidi, Remark 17., Aequationes Math., vol. 29, 1985.
- L. Székelyhidi, The stability of d’Alembert–type functional equations, Acta Sci. Math. Szeged, vol. 44, pp. 313–320, 1982.
- L. Székelyhidi, On the zeros of exponential polynomials, C. R. Math. Rep. Acad. Sci. Canada, vol. 4(4), pp. 189–194, 1982.
- L. Székelyhidi, Note on a stability theorem, Canadian Math. Bull., vol. 25(4), pp. 500–501, 1982.
- L. Székelyhidi, Note on exponential polynomials, Pacific J. Math., vol. 103(2), pp. 583–587, 1982.
- L. Székelyhidi, On a class of linear functional equations, Publ. Math. Debrecen, vol. 29, pp. 19–28, 1982.
- L. Székelyhidi, On a theorem of Baker, Lawrence and Zorzitto, Proc. Amer. Math. Soc., vol. 84, pp. 95–96, 1982.
- L. Székelyhidi, Exponential Polynomials and Functional Equations on Topological Groups, 1982. CSc Thesis.
- M. Lénárd and L. Székelyhidi, Functional-differential equations by spline functions, Ann. Univ. Sci. Budapest, Sect. Comput., vol. 3, pp. 25–32, 1982.
- M. Lénárd and L. Székelyhidi, Functional-differential equations by spline functions, pp. 433–436, Rousse, Bulgaria: Techn. Univ. Rousse, 1982.
- L. Székelyhidi, Functional equations on abelian groups, Acta Math. Acad. Sci. Hung., vol. 37, pp. 235–243, 1981.
- L. Székelyhidi, An extension theorem for a functional equation, Publ. Math. Debrecen, vol. 28, pp. 257–279, 1981.
- L. Székelyhidi, On a stability theorem, C. R. Math. Rep. Acad. Sci. Canada, vol. 3(5), pp. 253–255, 1981.
- L. Székelyhidi, The stability of linear functional equations, C. R. Math. Rep. Acad. Sci. Canada, vol. 3(2), pp. 63–67, 1981.
- L. Székelyhidi, Almost periodic functions and functional equations, Acta Sci. Math. Szeged, vol. 42, pp. 165–169, 1980.
- L. Székelyhidi, Remark on a paper of M. A. McKiernan, Ann. Polon. Math., vol. 36, pp. 245–247, 1979.
- L. Székelyhidi, On a Class of Linear Functional Equations, (in Hungarian), 1978. PhD Thesis.
- Z. Daróczy, K. Lajkó, and L. Székelyhidi, Functional equations on ordered fields, Publ. Math. Debrecen, vol. 24(1–2), pp. 173–179, 1977.
- L. Székelyhidi, Ergodic Theory and Invariant Measures, (in Hungarian), 1975. Master Thesis.
- L. Székelyhidi, The general representation of additive functions on open sets (Hungarian with English abstract), Magyar Tud. Akad. Mat. Fiz. Oszt. Közl., vol. 21, pp. 503–509, 1972.