Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{NUMA_1972__19_132145, author = {P. Lancaster}, title = {A {Note} on {Sub-Multiplicative} {Norms.}}, journal = {Numerische Mathematik}, pages = {206--208}, publisher = {mathdoc}, volume = {19}, year = {1972}, zbl = {0227.15007}, url = {http://geodesic.mathdoc.fr/item/NUMA_1972__19_132145/} }
P. Lancaster. A Note on Sub-Multiplicative Norms.. Numerische Mathematik, Tome 19 (1972), pp. 206-208. http://geodesic.mathdoc.fr/item/NUMA_1972__19_132145/