Geodesic
Asymptotic behavior of spectral functions of the differential operators $-y''-\varepsilon x^2y$
Matematičeskie zametki, Tome 63 (1998) no. 2, pp. 302-306 
A. S. Pechentsov; A. Yu. Popov. Asymptotic behavior of spectral functions of the differential operators $-y''-\varepsilon x^2y$. Matematičeskie zametki, Tome 63 (1998) no. 2, pp. 302-306. http://geodesic.mathdoc.fr/item/MZM_1998_63_2_a17/
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     title = {Asymptotic behavior of spectral functions of the differential operators $-y''-\varepsilon x^2y$},
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     year = {1998},
     volume = {63},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1998_63_2_a17/}
}
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[2] Titchmarsh E. C., Proc. Roy. Soc. London. Ser. A, 207 (1951), 321–328 | DOI | MR | Zbl

[3] Pechentsov A. S., Popov A. Yu., Matem. zametki, 61:5 (1997), 793–796 | MR | Zbl

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