On the concavity of the surface of eigenvalues
Matematičeskie zametki, Tome 61 (1997) no. 6, pp. 946-949.

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A. A. Lokshin. On the concavity of the surface of eigenvalues. Matematičeskie zametki, Tome 61 (1997) no. 6, pp. 946-949. http://geodesic.mathdoc.fr/item/MZM_1997_61_6_a16/

[1] Tsyulike L., Kvantovaya khimiya, T. 1, Mir, M., 1976

[2] Epshtein S., Variatsionnyi metod v kvantovoi khimii, Mir, M., 1977