TY  - JOUR
AU  - P. I. Petrov
TI  - On differential invariants of conformally flat three-dimensional Riemannian spaces
JO  - Učënye zapiski Kazanskogo universiteta. Seriâ Fiziko-matematičeskie nauki
PY  - 1954
SP  - 109
EP  - 122
VL  - 114
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/UZKU_1954_114_2_a6/
LA  - ru
ID  - UZKU_1954_114_2_a6
ER  -