@article{GDZPPN002411407, title = {The Relationship of Matrix Norms to Matrix Singularities.}, journal = {Mathematische Zeitschrift}, volume = {129}, year = {1972}, pages = {365-369}, zbl = {0254.40004}, url = {http://dml.mathdoc.fr/item/GDZPPN002411407} }
Petersen, Gordon M. The Relationship of Matrix Norms to Matrix Singularities.. Mathematische Zeitschrift, Tome 129 (1972) pp. 365-369. http://gdmltest.u-ga.fr/item/GDZPPN002411407/