%0 Journal Article
%A V. A. Baikov
%A R. K. Gazizov
%A N. H. Ibragimov
%T Approximate group analysis of the nonlinear equation $u_{tt}-(f(u)u_x)_x+\varepsilon\varphi(u)u_t=0$
%J Differencialʹnye uravneniâ
%D 1988
%P 1127-1138
%V 24
%N 7
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1988_24_7_a3/
%G ru
%F DE_1988_24_7_a3