@article{JAC_1999__9_2_a4,
     author = {Cs\'ak\'any, Rita and Kahn, Jeff},
     title = {A homological approach to two problems on finite sets},
     journal = {Journal of Algebraic Combinatorics},
     pages = {141--149},
     publisher = {mathdoc},
     volume = {9},
     number = {2},
     year = {1999},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JAC_1999__9_2_a4/}
}