TY  - JOUR
AU  - Yu. G. Borisovich
TI  - An application of the concept of rotation of a vector field
JO  - Doklady Akademii Nauk
PY  - 1963
SP  - 12
EP  - 15
VL  - 153
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1963_153_1_a1/
LA  - ru
ID  - DAN_1963_153_1_a1
ER  -