PageHeader : Funkcialaj Ekvacioj, 23 (1980) 1-16 Title : A Goursat Problem for a Polyvibrating Equation Title : of D. Mangeron AuthorInfo : By AuthorInfo : Andrzej BORZYMOWSKI AuthorInfo : (Warsaw Technical University, Poland) section : 1. Introduction. section : 2. The problem. section : 3. Solution of the problem. section : References