TY - JOUR T1 - Differential equations with multiple solutions and nonlinear functional analysis JF - Equadiff 82 (Wurzburg, 1982), 10--37, Lecture Notes in Math., 1017, Springer, Berlin, 1983 Y1 - 1982 A1 - Antonio Ambrosetti PB - SISSA Library UR - http://hdl.handle.net/1963/222 U1 - 3745 U2 - Mathematics U3 - Functional Analysis and Applications ER -