C. Pelea, Multialgebras and term functions over the algebra of their nonvoid subsets, Algebra Symposium, Cluj-Napoca, November 23-24, 2001
C. Pelea, I. Purdea, Universal algebras, congruences and complete multialgebras, Algebra Symposium, Cluj-Napoca, 2005
C. Pelea, I. Purdea, Direct limits of direct systems of hypergroupoids associated to binary relations, Symposium Mathematics of Uncertainty, ECIT 2006, Iasi, Romania, September 20-23, 2006
C. Pelea, Multialgebras, universal algebras and identities, 6-th Congress of Romanian Mathematicians, Bucharest, Romania, June 28-July 4, 2007
C. Pelea, Products of multialgebras and their fundamental algebras, ICTAMI 2007, Alba Iulia, Romania, August 29-September 2, 2007
C. Pelea, I. Purdea, Identities in multialgebra theory, AHA 2008, Brno, Czech Republic, September 3-9, 2008
C. Pelea, I. Purdea, Term functions and polynomial functions in hyperstructure theory , Open problems in algebraic hyperstructure theory and applications, Univ. Al. I. Cuza, Iasi, September 24-26, 2011
C. Pelea, Multialgebras, factor multialgebras and universal algebras, Workshop on General Algebra, Dresden University of Technology, June 7-10, 2012 (conference participation supported by the CNCS-UEFISCDI grant PN-II-RU-TE-2011-3-0065)
C. Pelea, Term functions in multialgebra theory, Conference on Universal Algebra and Lattice Theory, Szeged, June 21-25, 2012 (conference participation supported by the CNCS-UEFISCDI grant PN-II-RU-TE-2011-3-0065)
C. Pelea, On some particular equivalence relations of multialgebras, 9th International Conference on Applied Mathematics (ICAM 9), Baia Mare, September 25-28, 2013 (conference participation supported by the CNCS-UEFISCDI grant PN-II-RU-TE-2011-3-0065)
C. Pelea, Fundamental relations in multialgebras. A survey, AHA 2014, Xanthi, Greece, September 2-7, 2014 (conference participation supported by the CNCS-UEFISCDI grant PN-II-RU-TE-2011-3-0065)
C. Pelea, On some category theory constructions of multialgebras, 11th Joint Conference on Mathematics and Computer Science, Eger, May 20--22, 2016 (conference participation supported by the CNCS-UEFISCDI grant PN-II-ID-PCE-2012-4-0100)