@article{FAA_1971_5_4_a1,
     author = {P. P. Zabreiko and M. A. Krasnosel'skii and Yu. V. Pokornyi},
     title = {On a class of linear positive operators},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {9--17},
     publisher = {mathdoc},
     volume = {5},
     number = {4},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1971_5_4_a1/}
}