%0 Journal Article
%A Z. A. Steingrad
%T Einstein--Maxwell equation system and the calibration of four vector of the electromagnetic field
%J Doklady Akademii Nauk
%D 1978
%P 85-88
%V 243
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1978_243_1_a20/
%G ru
%F DAN_1978_243_1_a20