TY  - JOUR
AU  - M. I. Zelikin
AU  - V. F. Borisov
TI  - Fields of optimal trajectories that contain second-order singular
JO  - Doklady Akademii Nauk
PY  - 1989
SP  - 1050
EP  - 1053
VL  - 304
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1989_304_5_a4/
LA  - ru
ID  - DAN_1989_304_5_a4
ER  -