@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/}
}