Geodesic
On Spectrum of Differential Operator with Block-Triangular Matrix Coefficients
Žurnal matematičeskoj fiziki, analiza, geometrii, Tome 10 (2014) no. 1, pp. 44-63 Cet article a éte moissonné depuis la source Math-Net.Ru

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For the Sturm–Louville equation with block-triangular matrix potential that increases at infinity, both increasing and decreasing at infinity matrix solutions are found. The structure of spectrum for the differential operator with these coefficients is defined. 
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A. M. Kholkin; F. S. Rofe-Beketov. On Spectrum of Differential Operator with Block-Triangular Matrix Coefficients. Žurnal matematičeskoj fiziki, analiza, geometrii, Tome 10 (2014) no. 1, pp. 44-63. http://geodesic.mathdoc.fr/item/JMAG_2014_10_1_a1/

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