On the deficiency indices of a~differential operator of fourth order
Matematičeskie zametki, Tome 57 (1995) no. 2, pp. 313-314.

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     title = {On the deficiency indices of a~differential operator of fourth order},
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A. R. Sagitova. On the deficiency indices of a~differential operator of fourth order. Matematičeskie zametki, Tome 57 (1995) no. 2, pp. 313-314. http://geodesic.mathdoc.fr/item/MZM_1995_57_2_a17/

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