@article{GDZPPN001166573, title = {Characterizations of Certain Classes of Norms.}, journal = {Numerische Mathematik}, volume = {10}, year = {1967}, pages = {30-41}, zbl = {0164.17603}, url = {http://dml.mathdoc.fr/item/GDZPPN001166573} }
GRIES, D. Characterizations of Certain Classes of Norms.. Numerische Mathematik, Tome 10 (1967) pp. 30-41. http://gdmltest.u-ga.fr/item/GDZPPN001166573/