@article{DE_1998_34_12_a15,
     author = {A. K. Demenchuk},
     title = {On the existence and stability of quasiperiodic solutions of systems of second-order linear differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1699--1700},
     publisher = {mathdoc},
     volume = {34},
     number = {12},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1998_34_12_a15/}
}