Geodesic
The continuous spectrum of differential operators
Funkcionalʹnyj analiz i ego priloženiâ, Tome 11 (1977) no. 1, pp. 43-54.

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V. I. Feigin. The continuous spectrum of differential operators. Funkcionalʹnyj analiz i ego priloženiâ, Tome 11 (1977) no. 1, pp. 43-54. http://geodesic.mathdoc.fr/item/FAA_1977_11_1_a4/

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