@article {1982,
	title = {Differential equations with multiple solutions and nonlinear functional analysis},
	journal = {Equadiff 82 (Wurzburg, 1982), 10--37, Lecture Notes in Math., 1017, Springer, Berlin, 1983},
	number = {SISSA;71/82/M},
	year = {1982},
	publisher = {SISSA Library},
	url = {http://hdl.handle.net/1963/222},
	author = {Antonio Ambrosetti}
}
