Geodesic
Asymptotic series for the eigenvalues and eigenfunctions of second order self-adjoint operators
Differencialʹnye uravneniâ, Tome 7 (1971) no. 4, pp. 603-614 
G. V. Zhdanova. Asymptotic series for the eigenvalues and eigenfunctions of second order self-adjoint operators. Differencialʹnye uravneniâ, Tome 7 (1971) no. 4, pp. 603-614. http://geodesic.mathdoc.fr/item/DE_1971_7_4_a2/
@article{DE_1971_7_4_a2,
     author = {G. V. Zhdanova},
     title = {Asymptotic series for the eigenvalues and eigenfunctions of second order self-adjoint operators},
     journal = {Differencialʹnye uravneni\^a},
     pages = {603--614},
     year = {1971},
     volume = {7},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_4_a2/}
}
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