Geodesic
The asymptotics of solutions to ordinary linear differential equations of the $n$-th order
Differencialʹnye uravneniâ, Tome 2 (1966) no. 4, pp. 492-507 
M. V. Fedoryuk. The asymptotics of solutions to ordinary linear differential equations of the $n$-th order. Differencialʹnye uravneniâ, Tome 2 (1966) no. 4, pp. 492-507. http://geodesic.mathdoc.fr/item/DE_1966_2_4_a4/
@article{DE_1966_2_4_a4,
     author = {M. V. Fedoryuk},
     title = {The asymptotics of solutions to ordinary linear differential equations of the $n$-th order},
     journal = {Differencialʹnye uravneni\^a},
     pages = {492--507},
     year = {1966},
     volume = {2},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1966_2_4_a4/}
}
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