Geodesic
Spectral Problems for the Dirac System with Spectral Parameter in Local Boundary Conditions
Funkcionalʹnyj analiz i ego priloženiâ, Tome 35 (2001) no. 3, pp. 1-18.

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We consider a spectral boundary value problem in a $3$-dimensional bounded domain for the Dirac system that describes the behavior of a relativistic particle in an electromagnetic field. The spectral parameter is contained in a local boundary condition. We prove that the eigenvalues of the problem have finite multiplicities and two points of accumulation, zero and infinity and indicate the asymptotic behavior of the corresponding series of eigenvalues. We also show the existence of an orthonormal basis on the boundary consisting of two-dimensional parts of the four-dimensional eigenfunctions. 
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M. S. Agranovich. Spectral Problems for the Dirac System with Spectral Parameter in Local Boundary Conditions. Funkcionalʹnyj analiz i ego priloženiâ, Tome 35 (2001) no. 3, pp. 1-18. http://geodesic.mathdoc.fr/item/FAA_2001_35_3_a0/

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