@article{IVM_1987_12_a15,
     author = {E. V. Voskresenskiǐ},
     title = {Asymptotic equivalence of nonlinear differential equations},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {72--74},
     year = {1987},
     number = {12},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1987_12_a15/}
}