TY  - JOUR
AU  - V. D. Zakharov
TI  - A physical characteristic of Einsteinian spaces of the second degenerate type in the Petrov classification
JO  - Doklady Akademii Nauk
PY  - 1965
SP  - 563
EP  - 565
VL  - 161
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1965_161_3_a18/
LA  - ru
ID  - DAN_1965_161_3_a18
ER  -