@article{CMUC_1970_11_2_a7,
     author = {Kurzweil, Jaroslav},
     title = {Invariant manifolds. {I}},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {309--336},
     year = {1970},
     volume = {11},
     number = {2},
     mrnumber = {0296963},
     zbl = {0197.47702},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1970_11_2_a7/}
}