@article{1031732779,
author = {Pearcy, Carl},
title = {An elementary proof of the power inequality for the numerical radius.},
journal = {Michigan Math. J.},
volume = {13},
number = {1},
year = {1966},
pages = { 289-291},
language = {en},
url = {http://dml.mathdoc.fr/item/1031732779}
}
Pearcy, Carl. An elementary proof of the power inequality for the numerical radius.. Michigan Math. J., Tome 13 (1966) no. 1, pp. 289-291. http://gdmltest.u-ga.fr/item/1031732779/