Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{NUMA_1965__7_131659, author = {J. FOCKE}, title = {\"Uber die {Multiplikativit\"at} von {Matrizennormen.}}, journal = {Numerische Mathematik}, pages = {251--254}, publisher = {mathdoc}, volume = {7}, year = {1965}, url = {http://geodesic.mathdoc.fr/item/NUMA_1965__7_131659/} }
J. FOCKE. Über die Multiplikativität von Matrizennormen.. Numerische Mathematik, Tome 7 (1965), pp. 251-254. http://geodesic.mathdoc.fr/item/NUMA_1965__7_131659/