Geodesic
On the question of completeness of the system of eigenfunctions of a nonregular ordinary differential pencil
Doklady Akademii Nauk, Tome 257 (1981) no. 1, pp. 15-18 
A. I. Vahabov. On the question of completeness of the system of eigenfunctions of a nonregular ordinary differential pencil. Doklady Akademii Nauk, Tome 257 (1981) no. 1, pp. 15-18. http://geodesic.mathdoc.fr/item/DAN_1981_257_1_a1/
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     author = {A. I. Vahabov},
     title = {On the question of completeness of the system of eigenfunctions of a nonregular ordinary differential pencil},
     journal = {Doklady Akademii Nauk},
     pages = {15--18},
     year = {1981},
     volume = {257},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1981_257_1_a1/}
}
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