Geodesic
The completeness of eigenfunctions and associated functions of an ordinary differential operator with irregular-separated boundary conditions
Funkcionalʹnyj analiz i ego priloženiâ, Tome 10 (1976) no. 4, pp. 69-80 
A. A. Shkalikov. The completeness of eigenfunctions and associated functions of an ordinary differential operator with irregular-separated boundary conditions. Funkcionalʹnyj analiz i ego priloženiâ, Tome 10 (1976) no. 4, pp. 69-80. http://geodesic.mathdoc.fr/item/FAA_1976_10_4_a6/
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