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@article{IM_1987__88_143447, author = {G. Kalai}, title = {Rigidity and the lower bound {Theorem} l.}, journal = {Inventiones mathematicae}, pages = {125--152}, publisher = {mathdoc}, volume = {88}, year = {1987}, zbl = {0624.52004}, url = {http://geodesic.mathdoc.fr/item/IM_1987__88_143447/} }
G. Kalai. Rigidity and the lower bound Theorem l.. Inventiones mathematicae, Tome 88 (1987), pp. 125-152. http://geodesic.mathdoc.fr/item/IM_1987__88_143447/