@article{DAN_1967_176_6_a5,
     author = {P. P. Zabreiko and M. A. Krasnosel'skii},
     title = {A way of obtaining new fixed-point principles},
     journal = {Doklady Akademii Nauk},
     pages = {1233--1235},
     publisher = {mathdoc},
     volume = {176},
     number = {6},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1967_176_6_a5/}
}