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@article{PORMA_1985__43_1_114535, author = {Hern\'andez, Vicente G.}, title = {Algebraic matrix equations in systems theory}, journal = {Portugaliae mathematica}, pages = {17--33}, publisher = {mathdoc}, volume = {43}, number = {1}, year = {1985}, mrnumber = {0875049}, zbl = {0598.15013}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1985__43_1_114535/} }
Hernández, Vicente G. Algebraic matrix equations in systems theory. Portugaliae mathematica, Tome 43 (1985) no. 1, pp. 17-33. http://geodesic.mathdoc.fr/item/PORMA_1985__43_1_114535/