%0 Journal Article %A I. N. Sergeev %T Oscillation, rotatability, and wandering characteristic indicators for differential systems determining rotations of plane %J Vestnik Moskovskogo universiteta. Matematika, mehanika %D 2019 %P 21-26 %N 1 %U http://geodesic.mathdoc.fr/item/VMUMM_2019_1_a3/ %G ru %F VMUMM_2019_1_a3