@article{DAN_1965_165_5_a4,
     author = {V. V. Martynov},
     title = {Conditions of discreteness and continuity of the spectrum in the case of a self-conjugate system of first order differential equations},
     journal = {Doklady Akademii Nauk},
     pages = {996--999},
     publisher = {mathdoc},
     volume = {165},
     number = {5},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1965_165_5_a4/}
}