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@article{CMH_1979__54_139787, author = {Jens Frehse}, title = {A {Landesman-Lazer} alternative theorem for a class of optimization problems.}, journal = {Commentarii mathematici Helvetici}, pages = {328--333}, publisher = {mathdoc}, volume = {54}, year = {1979}, zbl = {0431.49003}, url = {http://geodesic.mathdoc.fr/item/CMH_1979__54_139787/} }
Jens Frehse. A Landesman-Lazer alternative theorem for a class of optimization problems.. Commentarii mathematici Helvetici, Tome 54 (1979), pp. 328-333. http://geodesic.mathdoc.fr/item/CMH_1979__54_139787/