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Publication:3937768
zbMath0481.35061MaRDI QIDQ3937768
Publication date: 1981
Title: zbMATH Open Web Interface contents unavailable due to conflicting licenses.
semilinear wave equationsaddle point reductionperiodic orbit with prescribed periodvariational methods of Lusternik-Schnirelman type
Equations involving nonlinear operators (general) (47J05) Periodic solutions to PDEs (35B10) Second-order nonlinear hyperbolic equations (35L70)
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