@article{05823124, title = {Positive solutions of a singular positone and semipositone boundary value problems for fourth-order difference equations.}, journal = {Discrete Dynamics in Nature and Society}, volume = {2010}, year = {2010}, doi = {10.1155/2010/312864}, zbl = {1204.39012}, language = {en}, url = {http://dml.mathdoc.fr/item/05823124} }
Yuan, Chengjun. Positive solutions of a singular positone and semipositone boundary value problems for fourth-order difference equations.. Discrete Dynamics in Nature and Society, Tome 2010 (2010) . doi : 10.1155/2010/312864. http://gdmltest.u-ga.fr/item/05823124/