@article{DE_1983_19_4_a2,
     author = {G. D. Zavalykut},
     title = {A numerical-analytic method for investigating periodic solutions of a class of operator-differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {569--575},
     publisher = {mathdoc},
     volume = {19},
     number = {4},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1983_19_4_a2/}
}