%0 Journal Article %A U. K. Nigul %T Asymptotic description of the process of weak distortion of the longitudinal-wave shape in a nonlinear hereditary elastic medium %J Doklady Akademii Nauk %D 1979 %P 60-63 %V 247 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1979_247_1_a13/ %G ru %F DAN_1979_247_1_a13