TY  - JOUR
AU  - V. Sh. Roitenberg
TI  - On second-order differential equations on the circle with the rst degree of structural instability
JO  - Matematičeskie zametki SVFU
PY  - 2023
SP  - 40
EP  - 50
VL  - 30
IS  - 1
UR  - http://geodesic.mathdoc.fr/item/SVFU_2023_30_1_a2/
LA  - ru
ID  - SVFU_2023_30_1_a2
ER  -