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@article{PORMA_2003__60_3_51141, author = {He, Xiaoming and Ge, Weigao}, title = {Positive solutions for semipositone boundary value problems.}, journal = {Portugaliae mathematica}, pages = {253--262}, publisher = {mathdoc}, volume = {60}, number = {3}, year = {2003}, zbl = {1055.34032}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_2003__60_3_51141/} }
He, Xiaoming; Ge, Weigao. Positive solutions for semipositone boundary value problems.. Portugaliae mathematica, Tome 60 (2003) no. 3, pp. 253-262. http://geodesic.mathdoc.fr/item/PORMA_2003__60_3_51141/