Geodesic
Asymptotic methods in the theory of ordinary differential equations with small parameters multiplying the highest derivatives
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 17 (1962) no. 4 
A. B. Vasil'eva. Asymptotic methods in the theory of ordinary differential equations with small parameters multiplying the highest derivatives. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 17 (1962) no. 4. http://geodesic.mathdoc.fr/item/RM_1962_17_4_a19/
@article{RM_1962_17_4_a19,
     author = {A. B. Vasil'eva},
     title = {Asymptotic methods in the theory of ordinary differential equations with small parameters multiplying the highest derivatives},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     year = {1962},
     volume = {17},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1962_17_4_a19/}
}
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