@article{DAN_1960_135_3_a5,
     author = {M. A. Krasnosel'skii},
     title = {Fixed points of cone-compressing or cone-extending operators},
     journal = {Doklady Akademii Nauk},
     pages = {527--530},
     publisher = {mathdoc},
     volume = {135},
     number = {3},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1960_135_3_a5/}
}