@article{05629317, title = {Sturm-Picone comparison theorem of second-order linear equations on time scales.}, journal = {Advances in Difference Equations [electronic only]}, volume = {2009}, year = {2009}, doi = {10.1155/2009/496135}, zbl = {1181.34109}, language = {en}, url = {http://dml.mathdoc.fr/item/05629317} }
Zhang, Chao; Sun, Shurong. Sturm-Picone comparison theorem of second-order linear equations on time scales.. Advances in Difference Equations [electronic only], Tome 2009 (2009) . doi : 10.1155/2009/496135. http://gdmltest.u-ga.fr/item/05629317/