%0 Journal Article %A B. S. Ènenstein %T On geological effectiveness of electromagnetic probings obtained by different methods %J Doklady Akademii Nauk %D 1975 %P 837-840 %V 222 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1975_222_4_a16/ %G ru %F DAN_1975_222_4_a16