TY  - JOUR
AU  - V. G. Boltyanskii
TI  - The maximum principle, black holes and quasars
JO  - Differencialʹnye uravneniâ
PY  - 1979
SP  - 1888
EP  - 1890
VL  - 15
IS  - 10
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1979_15_10_a15/
LA  - ru
ID  - DE_1979_15_10_a15
ER  -