@article{02163617, title = {Focal decompositions for linear differential equations of the second order.}, journal = {Abstract and Applied Analysis}, volume = {2003}, year = {2003}, pages = {813-821}, doi = {10.1155/S1085337503212057}, zbl = {1080.34513}, language = {en}, url = {http://dml.mathdoc.fr/item/02163617} }
Birbrair, L.; Sobolevsky, M.; Sobolevskii, P. Focal decompositions for linear differential equations of the second order.. Abstract and Applied Analysis, Tome 2003 (2003) pp. 813-821. doi : 10.1155/S1085337503212057. http://gdmltest.u-ga.fr/item/02163617/