@article{DAN_1991_318_4_a8,
     author = {A. A. Martynyuk},
     title = {A theorem on polystability},
     journal = {Doklady Akademii Nauk},
     pages = {808--811},
     year = {1991},
     volume = {318},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_318_4_a8/}
}