@article{DE_1995_31_6_a23,
     author = {Yu. L. Sachkov},
     title = {Invariant orthants of bilinear systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1094--1095},
     publisher = {mathdoc},
     volume = {31},
     number = {6},
     year = {1995},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1995_31_6_a23/}
}