@article{DAN_1976_228_3_a3,
     author = {V. V. Laricheva},
     title = {A generalization of perturbation theory for a nonlinear system that loses a small parameter in a subset of the range of the solution},
     journal = {Doklady Akademii Nauk},
     pages = {533--536},
     publisher = {mathdoc},
     volume = {228},
     number = {3},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1976_228_3_a3/}
}