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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     author = {M. G. Gimadislamov},
     title = {Discreteness of the {Spectrum} of a {Polar} {Differential} {Operation} in the {Space} of {Vector} {Functions}},
     journal = {Matemati\v{c}eskie zametki},
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     year = {2009},
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     url = {http://geodesic.mathdoc.fr/item/MZM_2009_85_3_a3/}
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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/