@article{DE_1971_7_7_a12,
     author = {P. P. Zabreiko and A. I. Povolotskii},
     title = {Eigenfunctions of the {Hammerstein} operator},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1294--1304},
     publisher = {mathdoc},
     volume = {7},
     number = {7},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_7_a12/}
}