@article{JAC_1999__9_3_a5,
     author = {Duval, Art M.},
     title = {On $f$-vectors and relative homology},
     journal = {Journal of Algebraic Combinatorics},
     pages = {215--232},
     publisher = {mathdoc},
     volume = {9},
     number = {3},
     year = {1999},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JAC_1999__9_3_a5/}
}