I. The \(u^ 5\) Klein-Gordon equation. II. Anomalous singularities for semilinear wave equations. (English) Zbl 0473.35055

Nonlinear partial differential equations and their applications, Coll. de France Semin., Vol. I, Res. Notes Math. 53, 335-364 (1981).


35L70 Second-order nonlinear hyperbolic equations
35L75 Higher-order nonlinear hyperbolic equations
35B40 Asymptotic behavior of solutions to PDEs