@article{DAN_1977_235_6_a9,
     author = {V. F. Safonov},
     title = {Regularized asymptotic solutions of nonlinear singularly perturbed systems of differential equations},
     journal = {Doklady Akademii Nauk},
     pages = {1274--1276},
     publisher = {mathdoc},
     volume = {235},
     number = {6},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1977_235_6_a9/}
}