%0 Journal Article %A V. N. Bakulin %A A. G. Protosenya %T On the presence of nonlinear effects in the propagation of elastic waves in rocks %J Doklady Akademii Nauk %D 1982 %P 314-316 %V 263 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1982_263_2_a15/ %G ru %F DAN_1982_263_2_a15