1. Abstract and concrete categories: the joy of cats;Adámek;Repr. Theory Appl. Categ.,2006
2. Congruences of multialgebras;Ameri;J. Mult.-Valued Logic Soft Comput.,2009
3. Fully invariant and verbal congruence relations;Bergman;Algebra Universalis,2013
4. Multialgebras and term functions over the algebra of their nonvoid subsets;Breaz;Mathematica (Cluj),2001
5. Products of hypergroupoids associated to binary relations;Breaz;Carpathian J. Math.,2009