Range sets and partition sets in connection with congruences and algebraic invariants.
Reconstructing some idempotent-generated semigroups from their biordered sets.
Reduction algorithms for some classes of aperiodic monoids
Rees quotients of N-semigroups.
Relations on the lattice of congruences of a regular semigroup.
Remarks on isomorphisms of regressive transformation semigroups.
Remarks on tolerance semigroups
Representation modulaire des F-réguliers.
Representations into the hyperspace of a compact group.
Residual finiteness of a class of semigroups presented by a single relation.
Retractions and S-endomorphisms.
Retracts and monomorphism monoids in semigroup varieties.
R-unipotent congruences on regular semigroups.