@article{CMUC_1964_5_3_a1,
     author = {H\'ajek, Otomar},
     title = {Critical points of abstract dynamical systems},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {121--124},
     year = {1964},
     volume = {5},
     number = {3},
     mrnumber = {0177402},
     zbl = {0134.42204},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1964_5_3_a1/}
}