Geodesic
The deficiency index of a certain higher order differential operator
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 32 (1977) no. 1 
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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     title = {The deficiency index of a~certain higher order differential operator},
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Voir la notice de l'article provenant de la source Math-Net.Ru

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