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@article{MAN_1972__199_162314, author = {Herbert Amann}, title = {Lusternik-Schnirelman {Theory} and {Non-Linear} {Eigenvalue} {Problems.}}, journal = {Mathematische Annalen}, pages = {55--72}, publisher = {mathdoc}, volume = {199}, year = {1972}, zbl = {0233.47049}, url = {http://geodesic.mathdoc.fr/item/MAN_1972__199_162314/} }
Herbert Amann. Lusternik-Schnirelman Theory and Non-Linear Eigenvalue Problems.. Mathematische Annalen, Tome 199 (1972), pp. 55-72. http://geodesic.mathdoc.fr/item/MAN_1972__199_162314/