@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/