@article{03669085, title = {Singular perturbation for nonlinear boundary-value problems.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {2}, year = {1979}, pages = {61-68}, doi = {10.1155/S0161171279000065}, zbl = {0429.34051}, language = {en}, url = {http://dml.mathdoc.fr/item/03669085} }
Ling, Rina. Singular perturbation for nonlinear boundary-value problems.. International Journal of Mathematics and Mathematical Sciences, Tome 2 (1979) pp. 61-68. doi : 10.1155/S0161171279000065. http://gdmltest.u-ga.fr/item/03669085/