1. Topologie;Alexandroff,1935
2. Bounds on the reliability polynomial for shellable independence systems;Ball;SIAM J. Algebraic Discrete Methods,1982
3. A. Björner, Homology of matroids (Preprint: Institut Mittag-Leffler, Djursholm, Sweden, 1979), revised version in “Combinatorial Geometries (The Theory of Matroids)” (H. Crapo, G. -C. Rota, and N. White, Eds.), to appear.
4. Shellable and Cohen-Macaulay partially ordered sets;Björner;Trans. Amer. Math. Soc.,1980
5. Homotopy type of posets and lattice complementation;Björner;J. Combin. Theory Ser. A,1981