The assignment problem with three job categories
The Different Ways of Stabbing Disjoint Convex Sets.
The generalized Schröder theory.
The Lotharingian impact on combinatorial mathematics: Myth or reality?
The partially ordered set of all J-classes of a finite semigroup.
The sequential join of combinatorial games.
Totally greedy coin sets and greedy obstructions.
Touchard polynomials, partial Bell polynomials and polynomials of binomial type.
Transversal and cotransversal matroids via their representations.