Geodesic
Refined asymptotic formulas for eigenvalues and eigenfunctions of the Dirac system with nondifferentiable potential
Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 12 (2012) no. 3, pp. 22-30.

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This paper investigates the Dirac system with the continuous potential. Asymptotic formulas for the eigenvalues (including refined) and eigenfunctions are established. As an application we obtain a theorem P. Dzhakova and B. S. Mityagin on the Riesz bases with brackets. 
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M. Sh. Burlutskaya; V. P. Kurdyumov; A. P. Khromov. Refined asymptotic formulas for eigenvalues and eigenfunctions of the Dirac system with nondifferentiable potential. Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 12 (2012) no. 3, pp. 22-30. http://geodesic.mathdoc.fr/item/ISU_2012_12_3_a3/

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