Geodesic
Regular boundary value problems for the Dirac operator
Doklady Rossijskoj akademii nauk. Matematika, informatika, processy upravleniâ, Tome 492 (2020), pp. 49-53

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Spectral problems for the Dirac operator specified on a finite interval with regular, but not strongly regular boundary conditions and a complex-valued integrable potential are studied. This work is aimed at finding the conditions under which the root function system forms a common Riesz basis rather than a Riesz basis with parentheses.
Keywords: Dirac operator, spectral expansion, regular boundary conditions. 
A. S. Makin. Regular boundary value problems for the Dirac operator. Doklady Rossijskoj akademii nauk. Matematika, informatika, processy upravleniâ, Tome 492 (2020), pp. 49-53. http://geodesic.mathdoc.fr/item/DANMA_2020_492_a9/
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