@article{DE_1969_5_4_a3,
     author = {V. M. Merkis},
     title = {The integration in closed form of certain linear systems of second order ordinary differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {641--647},
     publisher = {mathdoc},
     volume = {5},
     number = {4},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1969_5_4_a3/}
}