Guido Gentile and Vieri Mastropietro
Construction of periodic solutions of the nonlinear 
wave equation with Dirichlet boundary conditions 
by the Lindstedt series method
(486K, Postscript)

ABSTRACT.  We introduce and prove the convergence of a ``renormalized'' 
Lindstedt series for the oscillatory 
solutions of the nonlinear wave equation with Dirichlet 
boundary conditions, via Renormalization Group methods.