Geodesic
On the Deficiency Indices of a Singular Differential Operator of Fourth Order in the Space of Vector Functions
Matematičeskie zametki, Tome 86 (2009) no. 6, pp. 950-953.

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Keywords: singular differential operator of fourth order, deficiency index of an operator, operator in the space of vector functions, eigenvector of a matrix. 
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Ya. T. Sultanaev; O. V. Myakinova. On the Deficiency Indices of a Singular Differential Operator of Fourth Order in the Space of Vector Functions. Matematičeskie zametki, Tome 86 (2009) no. 6, pp. 950-953. http://geodesic.mathdoc.fr/item/MZM_2009_86_6_a14/

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