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@article{MZ_1979__169_172887, author = {Herbert Amann}, title = {Saddle {Points} and {Multiple} {Solutions} of {Differential} {Equations.}}, journal = {Mathematische Zeitschrift}, pages = {127--166}, publisher = {mathdoc}, volume = {169}, year = {1979}, zbl = {0414.47042}, url = {http://geodesic.mathdoc.fr/item/MZ_1979__169_172887/} }
Herbert Amann. Saddle Points and Multiple Solutions of Differential Equations.. Mathematische Zeitschrift, Tome 169 (1979), pp. 127-166. http://geodesic.mathdoc.fr/item/MZ_1979__169_172887/