Tests for completeness of root subspaces of a differentiation operator with abstract boundary conditions
Matematičeskie zametki, Tome 30 (1981) no. 4, pp. 543-552.

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@article{MZM_1981_30_4_a7,
     author = {G. M. Gubreev and A. I. Kovalenko},
     title = {Tests for completeness of root subspaces of a differentiation operator with abstract boundary conditions},
     journal = {Matemati\v{c}eskie zametki},
     pages = {543--552},
     publisher = {mathdoc},
     volume = {30},
     number = {4},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1981_30_4_a7/}
}
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G. M. Gubreev; A. I. Kovalenko. Tests for completeness of root subspaces of a differentiation operator with abstract boundary conditions. Matematičeskie zametki, Tome 30 (1981) no. 4, pp. 543-552. http://geodesic.mathdoc.fr/item/MZM_1981_30_4_a7/