@article{DAN_1987_297_4_a4,
     author = {V. D. Liseikin and V. E. Petrenko},
     title = {Numerical solution of nonlinear singularly perturbed problems},
     journal = {Doklady Akademii Nauk},
     pages = {791--794},
     year = {1987},
     volume = {297},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1987_297_4_a4/}
}