Geodesic
Discreteness of the Spectrum of a Polar Differential Operation in the Space of Vector Functions
Matematičeskie zametki, Tome 85 (2009) no. 3, pp. 351-355.

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Sufficient conditions for the discreteness of the spectrum of a polar differential operation in the space of vector functions are obtained.
Keywords: polar differential operation, space of vector functions, spectral theory, discrete spectrum, matrix function, splitting principle, deficiency index. 
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M. G. Gimadislamov. Discreteness of the Spectrum of a Polar Differential Operation in the Space of Vector Functions. Matematičeskie zametki, Tome 85 (2009) no. 3, pp. 351-355. http://geodesic.mathdoc.fr/item/MZM_2009_85_3_a3/

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