@article{05825766, title = {Nonlocal four-point boundary value problem for the singularly perturbed semilinear differential equations.}, journal = {Boundary Value Problems [electronic only]}, volume = {2011}, year = {2011}, doi = {10.1155/2011/570493}, zbl = {1209.34018}, language = {en}, url = {http://dml.mathdoc.fr/item/05825766} }
Vrabel, Robert. Nonlocal four-point boundary value problem for the singularly perturbed semilinear differential equations.. Boundary Value Problems [electronic only], Tome 2011 (2011) . doi : 10.1155/2011/570493. http://gdmltest.u-ga.fr/item/05825766/