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@article{CMH_1987__62_140082, author = {S. Halperin and Luchezar Avramov}, title = {On the non-vanishing of cotangent cohomology.}, journal = {Commentarii mathematici Helvetici}, pages = {169--184}, publisher = {mathdoc}, volume = {62}, year = {1987}, zbl = {0624.13013}, url = {http://geodesic.mathdoc.fr/item/CMH_1987__62_140082/} }
S. Halperin; Luchezar Avramov. On the non-vanishing of cotangent cohomology.. Commentarii mathematici Helvetici, Tome 62 (1987), pp. 169-184. http://geodesic.mathdoc.fr/item/CMH_1987__62_140082/