Geodesic
Asymptotic analysis of certain systems of linear differential equations with a large parameter
Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 49 (2009) no. 12, pp. 2144-2155

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Two classes of systems of linear ordinary differential equations containing high-frequency terms proportional to certain positive powers of the oscillation frequency are considered. Complete asymptotic expansions of fundamental systems of solutions are constructed and substantiated. 
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     author = {E. V. Krutenko and V. B. Levenshtam},
     title = {Asymptotic analysis of certain systems of linear differential equations with a~large parameter},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {2144--2155},
     publisher = {mathdoc},
     volume = {49},
     number = {12},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_2009_49_12_a4/}
}
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E. V. Krutenko; V. B. Levenshtam. Asymptotic analysis of certain systems of linear differential equations with a large parameter. Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 49 (2009) no. 12, pp. 2144-2155. http://geodesic.mathdoc.fr/item/ZVMMF_2009_49_12_a4/