@article{DE_1976_12_5_a12,
     author = {L. N. Lyapin},
     title = {Inclusions of {Hammerstein} type},
     journal = {Differencialʹnye uravneni\^a},
     pages = {908--915},
     publisher = {mathdoc},
     volume = {12},
     number = {5},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1976_12_5_a12/}
}