[1] On central series of wreath products (oroszul), International Colloquium on Group Theory to the memory of Tibor Szele, 1985. szeptember 16.-20., Debrecen.
[2] The coincidence of central series in wreath products (oroszul), XVIIIth Soviet Algebraic Conference, 1985, Kishinev (Szovjetunió).
[3] Modular group rings of p-groups and nilpotent wreath products, Second International Colloquium on Group Theory, 1987. augusztus 18.-21., Debrecen.
[4] Modular group rings and wreath products of groups, Second International Mathematical Mini Conference, 1988. augusztus 9.-18., Budapest.
[5] Modular abelian group codes, International Workshop "Algebraic and Combinatorial Coding Theory", 1988. szeptember 18.-24., Várna (Bulgária).
[6] Abelian group codes, XII. Österreichischer Mathematiker Kongress, 1989. szeptember 17.-22., Bécs (Ausztria).
[7] On iterated wreath products, Third International Colloquium on Group Theory, 1990. augusztus 13.-17., Debrecen.
[8] On exponent of group of normalized units of modular group algebras, International Conference "Group and Group Rings", 1993. szeptember 21.-24., Gliwice (Lengyelország).
[9] On nilpotent wreath products, Conference on Algebra and Combinatorics, 1994. március 6.-12., Königstein (Németország).
[10] On construction of some classes of quasi-hereditary algebras, Representation Theory and Computer Algebra Conference, 1997. március 18.-22., Kijev (Ukrajna).
[11] On the spectral radius of a Coxeter transformation, International Algebraic Conference dedicated to the memory of A. G. Kurosh, 1998. május 24.-28., Moszkva (Oroszország).
[12] On the bounds of spectral radius of a Coxeter transformation, The Xth Meeting on Representation Theory of Algebras, 1998. november 20.-21., Lennoxville, Quebec (Kanada).
[13] On the spectral radius of trees and of Coxeter transformation of trees, The First International Conference, Mathematical Science, ICM99, 1999. november 21.-23., Al Ain (Egyesült Arab Emírségek).
[14] Coxeter transformations and growth functions of Coxeter groups, Eighth International Conference on Group and Group Ring, 2000. június 6.-10., Wisla (Lengyelország).
[15] Coxeter transformations applied to number theory, XVth Meeting on Representation Theory of Algebras at the University of Sherbrooke, 2002. november 7.-9., Sherbrooke (Kanada).
[16] On a semigroup of reciprocal polynomials, 65th Workshop on General Algebra, 2003. március 20.-23., Potsdam (Németország).
[17] Zeros of Coxeter and reciprocal polynomials, International conference on algebras, modules and rings, 2003. július 14.-18., Lisszabon (Portugália).
[18] On spectral properties of Coxeter transformation, 4th International Algebraic Conference in Ukraine, 2003. augusztus 4.-9., Lvov (Ukrajna).
[19] Zeros of Coxeter and reciprocal polynomials, The Ninth International Conference on Functional Equations and Inequalities, 2003. szeptember 7.-13., Zlockie (Lengyelország).
[20] Spectral properties of Coxeter transformation, Special session on Linear Algebra at the AMS Meeting in Athens, 2004. március 26.-27., Ohio (USA).
[21] On spectral properties of Coxeter transformation, ICRA XI, 2004. augusztus 10.-21., Patzcuaro, Querentaro (Mexikó).
[22] On zeros of self-inversive polynomials, 5th International Algebraic Conference in Ukraine, 2005. július 20.-27., Odessa (Ukrajna).
[23] Graphs and famous algebraic integers, Applications of Algebra XIII, 2009. március 9.-14., Zakopane (Lengyelország).
(Ezen kívül több szemináriumi előadást tartott a következő országokban: Ukrajna, Olaszország, Németország, Anglia, Skócia, Kanada, Magyarország)