TY  - JOUR
AU  - Yu. F. Borisov
TI  - A~half-neighborhood and the variation of length of a~curve on a~surface
JO  - Informatics and Automation
PY  - 1965
SP  - 26
EP  - 48
VL  - 76
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/TRSPY_1965_76_a2/
LA  - ru
ID  - TRSPY_1965_76_a2
ER  -