Geodesic
The focussing problem and the asymptotic behavior of the spectral function of the Laplace--Beltrami operator
Doklady Akademii Nauk, Tome 230 (1976) no. 5, pp. 1017-1020.

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     author = {V. M. Babich and B. M. Levitan},
     title = {The focussing problem and the asymptotic behavior of the spectral function of the {Laplace--Beltrami} operator},
     journal = {Doklady Akademii Nauk},
     pages = {1017--1020},
     publisher = {mathdoc},
     volume = {230},
     number = {5},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1976_230_5_a0/}
}
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V. M. Babich; B. M. Levitan. The focussing problem and the asymptotic behavior of the spectral function of the Laplace--Beltrami operator. Doklady Akademii Nauk, Tome 230 (1976) no. 5, pp. 1017-1020. http://geodesic.mathdoc.fr/item/DAN_1976_230_5_a0/