TY  - JOUR
AU  - L. B. Grigoryeva
TI  - Chronometrically invariant representation of the classification of Petrov's gravitational fields
JO  - Doklady Akademii Nauk
PY  - 1970
SP  - 1251
EP  - 1254
VL  - 192
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1970_192_6_a15/
LA  - ru
ID  - DAN_1970_192_6_a15
ER  -