@article{01283582, title = {Nonlinear singularly perturbed systems of differential equations: A survey.}, journal = {Mathematical Problems in Engineering}, volume = {1}, year = {1995}, pages = {275-301}, doi = {10.1155/S1024123X95000172}, zbl = {0921.34055}, language = {en}, url = {http://dml.mathdoc.fr/item/01283582} }
Slavova, Angela. Nonlinear singularly perturbed systems of differential equations: A survey.. Mathematical Problems in Engineering, Tome 1 (1995) pp. 275-301. doi : 10.1155/S1024123X95000172. http://gdmltest.u-ga.fr/item/01283582/