Geodesic
On the completeness of the system of eigenfunctions of a class of partial differential operators
Doklady Akademii Nauk, Tome 222 (1975) no. 5, pp. 1020-1023 
I. I. Ibragimov; I. F. Kushnirchuk. On the completeness of the system of eigenfunctions of a class of partial differential operators. Doklady Akademii Nauk, Tome 222 (1975) no. 5, pp. 1020-1023. http://geodesic.mathdoc.fr/item/DAN_1975_222_5_a1/
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     author = {I. I. Ibragimov and I. F. Kushnirchuk},
     title = {On the completeness of the system of eigenfunctions of a class of partial differential operators},
     journal = {Doklady Akademii Nauk},
     pages = {1020--1023},
     year = {1975},
     volume = {222},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1975_222_5_a1/}
}
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