TY - GEN AU - Graffi, D TI - Nonlinear partial differential equations in physical problems T2 - Reasearch Notes in Mathematics, 42 SN - 0273084747 U1 - 515.353 PY - 1980/// CY - Boston PB - Pitman KW - ANALYSIS KW - DIFFERENTIAL EQUATIONS KW - MATHEMATICS KW - PARTIAL DIFFERENTIAL EQUATIONS ER -