@article{DAN_1967_177_6_a5,
     author = {S. A. Lomov},
     title = {A method of regularizing singular perturbations},
     journal = {Doklady Akademii Nauk},
     pages = {1273--1276},
     year = {1967},
     volume = {177},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1967_177_6_a5/}
}