@article{MZ_1994__216_4_174665,
     author = {Richard P. Stanley},
     title = {Flag f-vectors and the cd-index.},
     journal = {Mathematische Zeitschrift},
     pages = {483--500},
     publisher = {mathdoc},
     volume = {216},
     number = {4},
     year = {1994},
     zbl = {0805.06003},
     url = {http://geodesic.mathdoc.fr/item/MZ_1994__216_4_174665/}
}