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@article{CMUC_1964__5_3_a3, author = {H\'ajek, Otomar}, title = {Betti numbers of regions of attraction}, journal = {Commentationes Mathematicae Universitatis Carolinae}, pages = {129--132}, publisher = {mathdoc}, volume = {05}, number = {3}, year = {1964}, mrnumber = {0177403}, zbl = {0134.42301}, language = {en}, url = {http://geodesic.mathdoc.fr/item/CMUC_1964__5_3_a3/} }
Hájek, Otomar. Betti numbers of regions of attraction. Commentationes Mathematicae Universitatis Carolinae, Tome 05 (1964) no. 3, pp. 129-132. http://geodesic.mathdoc.fr/item/CMUC_1964__5_3_a3/