Geodesic
The distribution of eigenvalues of the Dirac operator
Matematičeskie zametki, Tome 14 (1973) no. 6, pp. 843-852.

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The Dirac system is studied on $(-\infty, \infty)$. Asymptotic formulas are obtained of the distribution for both positive, and negative eigenvalues. The asymptotic formulas, established in Theorem 1, are essentially different from formulas obtained by Sargsyan [1], and permit asymptotic formulas to be written for the distribution of positive (negative) eigenvalues, even in those cases when the negative (positive) spectrum is continuous, if appropriate conditions hold on the potential. 
@article{MZM_1973_14_6_a8,
     author = {M. Otelbaev},
     title = {The distribution of eigenvalues of the {Dirac} operator},
     journal = {Matemati\v{c}eskie zametki},
     pages = {843--852},
     publisher = {mathdoc},
     volume = {14},
     number = {6},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1973_14_6_a8/}
}
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M. Otelbaev. The distribution of eigenvalues of the Dirac operator. Matematičeskie zametki, Tome 14 (1973) no. 6, pp. 843-852. http://geodesic.mathdoc.fr/item/MZM_1973_14_6_a8/