Geodesic
Deficiency index and spectrum of a selfadjoint system of first-order differential equations
Doklady Akademii Nauk, Tome 181 (1968) no. 2, pp. 278-281.

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     author = {L. B. Zelenko},
     title = {Deficiency index and spectrum of a selfadjoint system of first-order differential equations},
     journal = {Doklady Akademii Nauk},
     pages = {278--281},
     publisher = {mathdoc},
     volume = {181},
     number = {2},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1968_181_2_a4/}
}
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L. B. Zelenko. Deficiency index and spectrum of a selfadjoint system of first-order differential equations. Doklady Akademii Nauk, Tome 181 (1968) no. 2, pp. 278-281. http://geodesic.mathdoc.fr/item/DAN_1968_181_2_a4/