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Approximate group analysis of the nonlinear equation \(u_{tt}-(f(u)u_ x)_ x+\varepsilon \phi (u)u_ t=0\). (English. Russian original) Zbl 0675.35018

Differ. Equations 24, No. 7, 719-728 (1988); translation from Differ. Uravn. 24, No. 7, 1127-1138 (1988).
Reviewer: P.Přikryl
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