Products of mode varieties and algebras of subalgebras
Propriétés catégorielles dans la théorie des algèbres universelles
Regular elements of the semigroup of all binary relations.
Regularity of the wreath product of monoids.
Relational classes and their characterizations
Remarks on heterogeneous algebras
Remarks on lattices of congruence relations of quasi-algebras
Remarks on subdirect representations in categories
Remarks on tolerance algebras
Representation of involuted semigroups by binary relations
Schreier-Zassenhaus theorem for algebras. I
Schreier-Zassenhaus theorem for algebras. II
Schützenberger groups of ...-classes in the semigroup of all binary relations on a set.
Schwache Teilbarkeitshalbgruppen.
Semigroup representations of medial groupoids
Simplicity of algebras requires to investigate almost all operations
Simultaneous nondeterministic games. I
Simultaneous nondeterministic games. II
Simultaneous nondeterministic games. III
Some Maximal Closed Classes of Operations on Infinite Sets.