Brini, A. Combinatorics and topology. Quillen’s theorem and Möbius. (Italian) Zbl 1192.55001 Boll. Unione Mat. Ital., Sez. A, Mat. Soc. Cult. (8) 7, No. 1, 143-172 (2004). MSC: 55-02 Research exposition (monographs, survey articles) pertaining to algebraic topology 05A15 Exact enumeration problems, generating functions PDFBibTeX XMLCite \textit{A. Brini}, Boll. Unione Mat. Ital., Sez. A, Mat. Soc. Cult. (8) 7, No. 1, 143--172 (2004; Zbl 1192.55001)