@article{10_37236_1672,
     author = {Ioan Tomescu},
     title = {Irreducible coverings by cliques and {Sperner's} theorem},
     journal = {The electronic journal of combinatorics},
     year = {2002},
     volume = {9},
     doi = {10.37236/1672},
     zbl = {1018.05079},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/1672/}
}