Geodesic
Quantum defect for the Dirac operator with a nonanalytic potential
Teoretičeskaâ i matematičeskaâ fizika, Tome 125 (2000) no. 3, pp. 444-452

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We evaluate the quantum defects for the continuous and discrete spectra of the radial Dirac operator with the potential $V(r)=-A/r+q(r)$, where $A>0$ and $\int_0^\infty|q|\*(1+\sqrt{r})dr\infty$. 
@article{TMF_2000_125_3_a3,
     author = {Kh. K. Ishkin and Kh. Kh. Murtazin},
     title = {Quantum defect for the {Dirac} operator with a nonanalytic potential},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {444--452},
     publisher = {mathdoc},
     volume = {125},
     number = {3},
     year = {2000},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2000_125_3_a3/}
}
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Kh. K. Ishkin; Kh. Kh. Murtazin. Quantum defect for the Dirac operator with a nonanalytic potential. Teoretičeskaâ i matematičeskaâ fizika, Tome 125 (2000) no. 3, pp. 444-452. http://geodesic.mathdoc.fr/item/TMF_2000_125_3_a3/