%0 Journal Article %A Crouzeix, Michel %T A note on the complex and real operator norms of real matrices %J ESAIM: Mathematical Modelling and Numerical Analysis %D 1986 %P 427-428 %V 20 %N 3 %I AFCET - Gauthier-Villars %C Paris %U http://geodesic.mathdoc.fr/item/M2AN_1986__20_3_427_0/ %G en %F M2AN_1986__20_3_427_0