TY  - JOUR
AU  - I. N. Sergeev
TI  - The definition of the indices of oscillation, rotation, and wandering of nonlinear differential systems
JO  - Vestnik Moskovskogo universiteta. Matematika, mehanika
PY  - 2021
SP  - 41
EP  - 46
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/VMUMM_2021_3_a5/
LA  - ru
ID  - VMUMM_2021_3_a5
ER  -