Geodesic
The completeness of the system of eigen- and associated functions of an elliptic operator in $R^n$
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 29 (1974) no. 5 
V. A. Kazhan. The completeness of the system of eigen- and associated functions of an elliptic operator in $R^n$. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 29 (1974) no. 5. http://geodesic.mathdoc.fr/item/RM_1974_29_5_a12/
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     title = {The completeness of the system of eigen- and associated functions of an elliptic operator in~$R^n$},
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     url = {http://geodesic.mathdoc.fr/item/RM_1974_29_5_a12/}
}
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[2] L. A. Bagirov, “Kraevye zadachi dlya ellipticheskikh uravnenii v neogranichennykh oblastyakh”, Vestnik MGU, 1969, no. 5, 66–72 | MR | Zbl

[3] I. Ts. Gokhberg, M. G. Krein, Vvedenie v teoriyu nesamosopryazhennykh operatorov, «Nauka», M., 1966

[4] S. Agmon, “On the eigenfunctions and on the eigenvalues of general elliptic boundary value problems”, Comm. Pure Appl. Math., 15:2 (1962), 119–147 | DOI | MR | Zbl