%0 Journal Article %A È. I. Parkhomenko %T Laboratory and field investigations into the piezoelectric effect of nepheline-containing rocks %J Doklady Akademii Nauk %D 1964 %P 1314-1316 %V 155 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1964_155_6_a17/ %G ru %F DAN_1964_155_6_a17