@article{RM_1977_32_1_a20,
author = {L. I. Anikeeva},
title = {The deficiency index of a~certain higher order differential operator},
journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
year = {1977},
volume = {32},
number = {1},
language = {ru},
url = {http://geodesic.mathdoc.fr/item/RM_1977_32_1_a20/}
}
L. I. Anikeeva. The deficiency index of a certain higher order differential operator. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 32 (1977) no. 1. http://geodesic.mathdoc.fr/item/RM_1977_32_1_a20/
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