@article{DE_1992_28_8_a5,
     author = {V. S. Pronkin},
     title = {On the existence of a quasiperiodic solution of a nonlinear differential equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1339--1346},
     publisher = {mathdoc},
     volume = {28},
     number = {8},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1992_28_8_a5/}
}