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@article{ARM_2000__36_5_a26, author = {Rudolf, Boris}, title = {Method of lower and upper solutions for a generalized boundary value problem}, journal = {Archivum mathematicum}, pages = {595--602}, publisher = {mathdoc}, volume = {36}, number = {5}, year = {2000}, mrnumber = {1822829}, zbl = {1090.34520}, language = {en}, url = {http://geodesic.mathdoc.fr/item/ARM_2000__36_5_a26/} }
Rudolf, Boris. Method of lower and upper solutions for a generalized boundary value problem. Archivum mathematicum, Tome 36 (2000) no. 5, pp. 595-602. http://geodesic.mathdoc.fr/item/ARM_2000__36_5_a26/