@article{MZ_1967__98_170743,
     author = {V.F. Cowling},
     title = {Inclusion {Relations} {Between} {Matrices.}},
     journal = {Mathematische Zeitschrift},
     pages = {192--195},
     year = {1967},
     volume = {98},
     zbl = {0147.04902},
     url = {http://geodesic.mathdoc.fr/item/MZ_1967__98_170743/}
}