TY - JOUR T1 - Periodic solutions of nonlinear wave equations with general nonlinearities JF - Comm.Math.Phys. 243 (2003) no.2, 315 Y1 - 2003 A1 - Massimiliano Berti A1 - Philippe Bolle PB - SISSA Library UR - http://hdl.handle.net/1963/1648 U1 - 2470 U2 - Mathematics U3 - Functional Analysis and Applications ER -