@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/}
}