PageHeader : Funkcialaj Ekvacioj, 42 (1999) 261-279 Title : Local Wellposedness and Dlposedness in the Critical Besov Title : Spaces for Semilinear Wave Equations with Quadratic Forms AuthorInfo : By AuthorInfo : Kenji NAKANISHI AuthorInfo : (The University of Tokyo, Japan) section : 1. Introduction section : 2. Deffiition and Notations section : 3. Critical bilinear estimates for wave equations section : 4. Proof of local wellposedness section : 5. Optimality of bih.near estimates section : 6. Dlposedness for the equation of wave map type section : References