@article{DAN_1973_208_6_a4,
     author = {M. A. Krasnosel'skii},
     title = {On several new fixed point principles},
     journal = {Doklady Akademii Nauk},
     pages = {1280--1281},
     publisher = {mathdoc},
     volume = {208},
     number = {6},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1973_208_6_a4/}
}