@article{DAN_1992_324_1_a6,
     author = {A. A. Martynyuk},
     title = {On the polystability of motion with respect to some of the},
     journal = {Doklady Akademii Nauk},
     pages = {39--41},
     publisher = {mathdoc},
     volume = {324},
     number = {1},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1992_324_1_a6/}
}