Geodesic
Two-sided asymptotics of the number of proper values of a~nonsemibounded Dirac operator
Izvestiya. Mathematics , Tome 6 (1972) no. 6, pp. 1381-1420.

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In this work is studied the asymptotic behavior of the number of proper values of the differential operator induced by a system of two ordinary differential equations of the first order. A method for computing two-sided asymptotics of the proper values of nonsemibounded selfadjoint differential operators is proposed. 
@article{IM2_1972_6_6_a8,
     author = {I. S. Sargsyan},
     title = {Two-sided asymptotics of the number of proper values of a~nonsemibounded {Dirac} operator},
     journal = {Izvestiya. Mathematics },
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     volume = {6},
     number = {6},
     year = {1972},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1972_6_6_a8/}
}
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I. S. Sargsyan. Two-sided asymptotics of the number of proper values of a~nonsemibounded Dirac operator. Izvestiya. Mathematics , Tome 6 (1972) no. 6, pp. 1381-1420. http://geodesic.mathdoc.fr/item/IM2_1972_6_6_a8/