• Criteria for a finite group to be an Iwasawa group, The days of the "Al. I. Cuza" University of Iaşi, October 2019.

  • A generalization of the Euler's totient function and its applications, The days of the "Al. I. Cuza" University of Iaşi, October 2018.

  • The Chermak-Delgado lattice of a finite group, The days of the "Al. I. Cuza" University of Iaşi, October 2017.

  • Criterii de comutativitate a grupurilor, Mathematics Teaching Seminar, Faculty of Mathematics, "Al. I. Cuza" University of Iaşi, March 2017.

  • A new poset associated to finite groups, The days of the "Al. I. Cuza" University of Iaşi, October 2016.

  • Sum-free sets in groups and hypergroups (with I. Tofan), The days of the "Al. I. Cuza" University of Iaşi, October 2015.

  • Subgroup commutativity degrees of finite groups, The days of the "Al. I. Cuza" University of Iaşi, October 2015.

  • Gradul de comutativitate al grupurilor finite, National Conference of SSMR, Iaşi, October 2014.

  • The posets of classes of isomorphic subgroups of finite groups, The days of the "Al. I. Cuza" University of Iaşi, October 2013.

  • Ireductibilitate în inele de polinoame, The days of the "Al. I. Cuza" University of Iaşi, October 2012.

  • Solitary quotients of finite groups, The days of the "Al. I. Cuza" University of Iaşi, October 2012.

  • Pseudocomplementation in (normal) subgroup lattices, The days of the "Al. I. Cuza" University of Iaşi, October 2011.

  • A probabilistic aspect of finite group theory, The days of the "Al. I. Cuza" University of Iaşi, October 2011.

  • A note on subgroup coverings of finite groups, The days of the "Al. I. Cuza" University of Iaşi, October 2009.

  • Finite groups determined by an inequality of the orders of their subgroups, The days of the "Al. I. Cuza" University of Iaşi, October 2009.

  • On the lattice of fuzzy subgroups of a finite group, The days of the "Al. I. Cuza" University of Iaşi, October 2008.

  • E-lattices and their applications, The days of the "Al. I. Cuza" University of Iaşi, October 2006.

  • Complementation in normal subgroup lattices (a survey), The Annual Symposium on Mathematics Applied in Biology & Biophysics, "Ion Ionescu de la Brad" University of Iaşi, June 2006.

  • Complementation in subgroup lattices (a survey), The Annual Symposium on Mathematics Applied in Biology & Biophysics, "Ion Ionescu de la Brad" University of Iaşi, June 2006.

  • A generalization of the lattice concept and its applications, The days of the "Al. I. Cuza" University of Iaşi, October 2005.

  • A note on U-decomposable groups, The Annual Symposium on Mathematics Applied in Biology & Biophysics, "Ion Ionescu de la Brad" University of Iaşi, May 2005.

  • On the group of autoprojectivities of an abelian p-group, Anniversary Symposion of "Gr. C. Moisil" Seminar, Iaşi, May 2005.

  • L-isomorphisms of groups, The days of the "Al. I. Cuza" University of Iaşi, October 2004.

  • On groups whose lattices of subgroups are pseudo-complemented, International Conference ECIT 2004, Iaşi, July 2004.

  • A special class of groups (U-decomposable groups), The Annual Symposium on Mathematics Applied in Biology & Biophysics, "Ion Ionescu de la Brad" University of Iaşi, May 2004.

  • Fundamental group lattices and applications, The days of the "Al. I. Cuza" University of Iaşi, October 2003.

  • An application of the group theory, International Conference SSIA 2003, Iaşi, September 2003.

  • Actions of finite groups on lattices, National School of Algebra, Eforie Nord, Constanţa, September 2003.

  • On the groups associated to genetic recombinations, The Annual Symposium on Mathematics Applied in Biology & Biophysics, "Ion Ionescu de la Brad" University of Iaşi, May 2003.

  • On the subgroup lattice of a semidirect product of finite cyclic groups, The days of the "Al. I. Cuza" University of Iaşi, October 2002.

  • On the subgroup lattice of an abelian finite group, International Conference ECIT 2002, Iaşi, July 2002.

  • Communications at Algebra Seminar, Faculty of Mathematics, "Al. I. Cuza" University of Iaşi.