@article{DE_1976_12_2_a10,
     author = {K. S. Sibirskii and V. D. Taku},
     title = {Algebraic invariants of multidimensional differential systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {281--291},
     publisher = {mathdoc},
     volume = {12},
     number = {2},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1976_12_2_a10/}
}