PageHeader : Funkcialaj Ekvacioj, 32 (1989) 125-144 Title : Existence of Global Strong Solution for Nonlinear Title : Klein-Gordon Equation AuthorInfo : By AuthorInfo : Takahiro MOTAI AuthorInfo : (The Tokyo University of Foreign Studies, Japan) section : 1. Introduction and results section : 2. Weak solution and regularizing problem section : 3. Estimate of the weak solution section : 4. Proof of Theorem section : References