@article{DE_1972_8_7_a22,
     author = {L. V. Trigubovich},
     title = {Certain sufficient criteria for the reducibility of second order linear systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1323--1325},
     publisher = {mathdoc},
     volume = {8},
     number = {7},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1972_8_7_a22/}
}