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Subharmonic Oscillations of a Semilinear Wave-equation

Bibliographic reference Willem, Michel. Subharmonic Oscillations of a Semilinear Wave-equation. In: Nonlinear Analysis: Theory, Methods & Applications, Vol. 9, no. 5, p. 503-514 (1985)
Permanent URL http://hdl.handle.net/2078.1/55286