@article{DAN_1969_188_6_a8,
     author = {Yu. S. Kolesov},
     title = {Schauder's principle, and stability of periodic solutions},
     journal = {Doklady Akademii Nauk},
     pages = {1234--1236},
     year = {1969},
     volume = {188},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_188_6_a8/}
}