Geodesic
Asymptotic expansions of the solutions of the $n$-order differential equations with two turning points
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 20, Tome 186 (1990), pp. 172-179 Cet article a éte moissonné depuis la source Math-Net.Ru

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The formal solutions of the equations indicated in the title are obtained and its analycity is investigated. 
@article{ZNSL_1990_186_a16,
     author = {I. N. Yakushina},
     title = {Asymptotic expansions of the solutions of the $n$-order differential equations with two turning points},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {172--179},
     year = {1990},
     volume = {186},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1990_186_a16/}
}
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I. N. Yakushina. Asymptotic expansions of the solutions of the $n$-order differential equations with two turning points. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 20, Tome 186 (1990), pp. 172-179. http://geodesic.mathdoc.fr/item/ZNSL_1990_186_a16/