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@article{PORMA_1996__53_3_47605, author = {De Coster, C. and Habets, P.}, title = {A two parameters {Ambrosetti-Prodi} problem.}, journal = {Portugaliae mathematica}, pages = {279--303}, publisher = {mathdoc}, volume = {53}, number = {3}, year = {1996}, zbl = {0858.35097}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1996__53_3_47605/} }
De Coster, C.; Habets, P. A two parameters Ambrosetti-Prodi problem.. Portugaliae mathematica, Tome 53 (1996) no. 3, pp. 279-303. http://geodesic.mathdoc.fr/item/PORMA_1996__53_3_47605/