Geodesic
Asymptotic behavior of the spectral function of the Schrödinger operator in an unbounded region
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 21 (1966) no. 5 
A. A. Arsen'ev. Asymptotic behavior of the spectral function of the Schrödinger operator in an unbounded region. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 21 (1966) no. 5. http://geodesic.mathdoc.fr/item/RM_1966_21_5_a10/
@article{RM_1966_21_5_a10,
     author = {A. A. Arsen'ev},
     title = {Asymptotic behavior of the spectral function of the {Schr\"odinger} operator in an unbounded region},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     year = {1966},
     volume = {21},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1966_21_5_a10/}
}
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[1] L. Gøarding, “On the asymptotic properties of the Spectral function belonguing to a rell-adjoint semi-bounded extension of an elliptic differential operator”, Kungl. Fyriografisha Scällskapets i Lund Förhandliger, 24:21 (1954)

[2] B. M. Levitan, “Ob asimptoticheskom povedenii spektralnoi funktsii i razlozhenii po sobstvennym funktsiyam uravneniya $\Delta u+\{\lambda-q(x)\}u=0$”, Trudy Mosk. matem. o-va, 4 (1955), 237–290 | MR