@article{VMUMM_1991_4_a5,
     author = {Yu. L. Sachkov},
     title = {Invariant domains of three-dimensional bilinear systems},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {23--26},
     publisher = {mathdoc},
     number = {4},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1991_4_a5/}
}