PageHeader : Funkcialaj Ekvacioj, 37 (1994) 175-194 Title : Existence of Solutions for Wave Equations with Time Dependent Title : Subdifferentials AuthorInfo : By AuthorInfo : Kenji MARUO AuthorInfo : (Kobe University of Mercantile Marine, Japan) section : 0. Introduction section : 1. Notations, Assumptions and Theorem section : 2. Preliminaries section : 3. Approximate solutions and their energy estimates section : 4. Proof of Theorem section : 5. Examples section : References