Geodesic
Criterion for Discreteness of the Spectrum of a Singular Canonical System
Funkcionalʹnyj analiz i ego priloženiâ, Tome 29 (1995) no. 3, pp. 75-78.

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I. S. Kats. Criterion for Discreteness of the Spectrum of a Singular Canonical System. Funkcionalʹnyj analiz i ego priloženiâ, Tome 29 (1995) no. 3, pp. 75-78. http://geodesic.mathdoc.fr/item/FAA_1995_29_3_a11/

[1] Kats I. S., “Lineinye otnosheniya, porozhdaemye kanonicheskimi differentsialnymi uravneniyami”, Funkts. analiz i ego pril., 17:4 (1983), 86–87 | MR | Zbl

[2] Kats I. S., Krein M. G., Izv. vuzov, ser. matem., 1958, no. 2(3), 136–153 | MR

[3] Kats I. S., Dep. v UkrNIINTI, No 1453, 1984

[4] De Branges L., Hilbert Spaces of Entire Functions, Prentice-Hall, New Jersey, 1968 | MR | Zbl

[5] Kotani S., “On a generalized Sturm-Liouville operator with a singular boundary”, J. Math. Kyoto Univ., 5:2 (1975), 423–454 | MR