@article{05629328, title = {Necessary and sufficient conditions for the existence of positive solution for singular boundary value problems on time scales.}, journal = {Advances in Difference Equations [electronic only]}, volume = {2009}, year = {2009}, doi = {10.1155/2009/737461}, zbl = {1182.34112}, language = {en}, url = {http://dml.mathdoc.fr/item/05629328} }
Feng, Meiqiang; Zhang, Xuemei; Li, Xianggui; Ge, Weigao. Necessary and sufficient conditions for the existence of positive solution for singular boundary value problems on time scales.. Advances in Difference Equations [electronic only], Tome 2009 (2009) . doi : 10.1155/2009/737461. http://gdmltest.u-ga.fr/item/05629328/