Geodesic
On properties of discrete and continuous spectra of Dirac radial equation
Teoretičeskaâ i matematičeskaâ fizika, Tome 108 (1996) no. 1, pp. 36-49

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For characterizing the spectrum of Dirac radial equation we introduce the notion of the quantum defect $\delta_k$, which generalizes the corresponding notion for Schrödinger radial equation. The existence of $\delta_k$ is proved and the formulas for calculating $\delta_k$ are received for a broad class of the potentials. 
@article{TMF_1996_108_1_a2,
     author = {L. A. Sakhnovich},
     title = {On properties of discrete and continuous spectra of {Dirac} radial equation},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {36--49},
     publisher = {mathdoc},
     volume = {108},
     number = {1},
     year = {1996},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1996_108_1_a2/}
}
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L. A. Sakhnovich. On properties of discrete and continuous spectra of Dirac radial equation. Teoretičeskaâ i matematičeskaâ fizika, Tome 108 (1996) no. 1, pp. 36-49. http://geodesic.mathdoc.fr/item/TMF_1996_108_1_a2/