Geodesic
Spectral theory of a pencil of skew-symmetric differential operators of third order on $S^1$
Funkcionalʹnyj analiz i ego priloženiâ, Tome 23 (1989) no. 2, pp. 1-11 
I. M. Gel'fand; I. S. Zakharevich. Spectral theory of a pencil of skew-symmetric differential operators of third order on $S^1$. Funkcionalʹnyj analiz i ego priloženiâ, Tome 23 (1989) no. 2, pp. 1-11. http://geodesic.mathdoc.fr/item/FAA_1989_23_2_a0/
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     title = {Spectral theory of a pencil of skew-symmetric differential operators of third order on $S^1$},
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