@article{DE_1969_5_6_a9,
     author = {V. S. Samovol},
     title = {The reduction of dynamical systems to triangular form},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1076--1082},
     publisher = {mathdoc},
     volume = {5},
     number = {6},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1969_5_6_a9/}
}