TY  - JOUR
AU  - А.В. Сарычев
TI  - The index of the second variation of a control system
JO  - Matematičeskij sbornik
PY  - 1980
SP  - 464
EP  - 486
VL  - 155
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MS_1980__155_3_a3/
LA  - en
ID  - MS_1980__155_3_a3
ER  -