@article{DAN_1971_200_2_a9,
     author = {M. A. Krasnosel'skii and A. V. Pokrovskii},
     title = {Systems of hysterons},
     journal = {Doklady Akademii Nauk},
     pages = {286--289},
     publisher = {mathdoc},
     volume = {200},
     number = {2},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1971_200_2_a9/}
}