@article{CMUC_1984__25_3_a8,
     author = {Krej\v{c}{\'\i}, Pavel},
     title = {Hard implicit function theorem and small periodic solutions to partial differential equations},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {519--536},
     publisher = {mathdoc},
     volume = {25},
     number = {3},
     year = {1984},
     mrnumber = {775567},
     zbl = {0567.35007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1984__25_3_a8/}
}