@article{DE_1965_1_12_a3,
     author = {V. V. Martynov},
     title = {The conditions of discreteness and continuity of the spectrum in case of a self-conjugate system of even order differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1578--1591},
     publisher = {mathdoc},
     volume = {1},
     number = {12},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1965_1_12_a3/}
}