@article{GDZPPN002399660, title = {Inclusion Relations Between Matrices.}, journal = {Mathematische Zeitschrift}, volume = {99}, year = {1967}, pages = {192-195}, zbl = {0147.04902}, url = {http://dml.mathdoc.fr/item/GDZPPN002399660} }
Cowling, V.F. Inclusion Relations Between Matrices.. Mathematische Zeitschrift, Tome 99 (1967) pp. 192-195. http://gdmltest.u-ga.fr/item/GDZPPN002399660/