TY - JOUR AU - Ioan Tomescu TI - Irreducible coverings by cliques and Sperner's theorem JO - The electronic journal of combinatorics PY - 2002 VL - 9 UR - http://geodesic.mathdoc.fr/articles/10.37236/1672/ DO - 10.37236/1672 ID - 10_37236_1672 ER -