@article{DE_1988_24_7_a3,
     author = {V. A. Baikov and R. K. Gazizov and N. H. Ibragimov},
     title = {Approximate group analysis of the nonlinear equation $u_{tt}-(f(u)u_x)_x+\varepsilon\varphi(u)u_t=0$},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1127--1138},
     publisher = {mathdoc},
     volume = {24},
     number = {7},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1988_24_7_a3/}
}