%0 Journal Article %A T. Sabirov %T The question of stability of small periodic solutions %J Doklady Akademii Nauk %D 1966 %P 755-757 %V 167 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1966_167_4_a7/ %G ru %F DAN_1966_167_4_a7