@article{DE_1999_35_12_a11,
     author = {M. Haydukevich and V. A. Chernyatin},
     title = {On the existence and stability of periodic solutions of an inhomogeneous hyperbolic equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1691--1700},
     publisher = {mathdoc},
     volume = {35},
     number = {12},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1999_35_12_a11/}
}