@article{PORMA_1985__43_1_114496,
     author = {Beitia, Maria Asunci\'on},
     title = {Matrices which commute with a given matrix upon a subspace},
     journal = {Portugaliae mathematica},
     pages = {167--178},
     publisher = {mathdoc},
     volume = {43},
     number = {1},
     year = {1985},
     mrnumber = {0875065},
     zbl = {0579.15017},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1985__43_1_114496/}
}