TY  - JOUR
AU  - P. I. Petrov
TI  - The fundamental problem of non-Riemannian geometry in a binary region
JO  - Doklady Akademii Nauk
PY  - 1961
SP  - 766
EP  - 768
VL  - 140
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1961_140_4_a7/
LA  - ru
ID  - DAN_1961_140_4_a7
ER  -