@article{GDZPPN002417898, title = {Nonlinear Eigenvalue Problems Having Precisely Two Solutions.}, journal = {Mathematische Zeitschrift}, volume = {147}, year = {1976}, pages = {27-38}, zbl = {0329.35027}, url = {http://dml.mathdoc.fr/item/GDZPPN002417898} }
Amann, Herbert. Nonlinear Eigenvalue Problems Having Precisely Two Solutions.. Mathematische Zeitschrift, Tome 147 (1976) pp. 27-38. http://gdmltest.u-ga.fr/item/GDZPPN002417898/