@article{00645189, title = {On two-point boundary value problems for systems of higher-order ordinary differential equations with singularities.}, journal = {Georgian Mathematical Journal}, volume = {1}, year = {1994}, pages = {31-45}, doi = {10.1007/BF02315301}, zbl = {0804.34023}, language = {en}, url = {http://dml.mathdoc.fr/item/00645189} }
Kiguradze, I.; Tskhovrebadze, G. On two-point boundary value problems for systems of higher-order ordinary differential equations with singularities.. Georgian Mathematical Journal, Tome 1 (1994) pp. 31-45. doi : 10.1007/BF02315301. http://gdmltest.u-ga.fr/item/00645189/