Tome 24 (1988) no. 7
Sommaire
p. 1107-1113
Approximate group analysis of the nonlinear equation $u_{tt}-(f(u)u_x)_x+\varepsilon\varphi(u)u_t=0$
p. 1127-1138
p. 1166-1171
p. 1218-1226
p. 1226-1234