@article{DE_1967_3_7_a8,
     author = {A. I. Zaitsev and K. K. Kapishev and V. Kh. Kharasakhal},
     title = {Quasiperiodic solutions of nonlinear systems of differential equations containing a small parameter},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1100--1112},
     publisher = {mathdoc},
     volume = {3},
     number = {7},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1967_3_7_a8/}
}