@article{1029000687,
author = {Crabb, Michael J.},
title = {The powers of an operator of numerical radius one.},
journal = {Michigan Math. J.},
volume = {18},
number = {1},
year = {1971},
pages = { 253-256},
language = {en},
url = {http://dml.mathdoc.fr/item/1029000687}
}
Crabb, Michael J. The powers of an operator of numerical radius one.. Michigan Math. J., Tome 18 (1971) no. 1, pp. 253-256. http://gdmltest.u-ga.fr/item/1029000687/