Geodesic
A criterion for the discreteness of the spectrum of a selfadjoint system of differential equations of the first order with slowly varying coefficients
Doklady Akademii Nauk, Tome 167 (1966) no. 6, pp. 1223-1225.

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     author = {R. S. Ismagilov and V. V. Martynov},
     title = {A criterion for the discreteness of the spectrum of a selfadjoint system of differential equations of the first order with slowly varying coefficients},
     journal = {Doklady Akademii Nauk},
     pages = {1223--1225},
     publisher = {mathdoc},
     volume = {167},
     number = {6},
     year = {1966},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1966_167_6_a2/}
}
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R. S. Ismagilov; V. V. Martynov. A criterion for the discreteness of the spectrum of a selfadjoint system of differential equations of the first order with slowly varying coefficients. Doklady Akademii Nauk, Tome 167 (1966) no. 6, pp. 1223-1225. http://geodesic.mathdoc.fr/item/DAN_1966_167_6_a2/