A note on the complex and real operator norms of real matrices
ESAIM: Mathematical Modelling and Numerical Analysis - Modélisation Mathématique et Analyse Numérique, Volume 20 (1986) no. 3, p. 427-428
@article{M2AN_1986__20_3_427_0,
author = {Crouzeix, Michel},
title = {A note on the complex and real operator norms of real matrices},
journal = {ESAIM: Mathematical Modelling and Numerical Analysis - Mod\'elisation Math\'ematique et Analyse Num\'erique},
publisher = {Dunod},
volume = {20},
number = {3},
year = {1986},
pages = {427-428},
zbl = {0609.15013},
mrnumber = {862785},
language = {en},
url = {http://www.numdam.org/item/M2AN_1986__20_3_427_0}
}

Crouzeix, Michel. A note on the complex and real operator norms of real matrices. ESAIM: Mathematical Modelling and Numerical Analysis - Modélisation Mathématique et Analyse Numérique, Volume 20 (1986) no. 3, pp. 427-428. http://www.numdam.org/item/M2AN_1986__20_3_427_0/