@article{1273587701, author = {NAKAZATO, Hiroshi}, title = {The $C$ -Numerical Range of a $3\times 3$ Normal Matrix}, journal = {Nihonkai Math. J.}, volume = {17}, number = {1}, year = {2006}, pages = { 187-197}, language = {en}, url = {http://dml.mathdoc.fr/item/1273587701} }
NAKAZATO, Hiroshi. The $C$ -Numerical Range of a $3\times 3$ Normal Matrix. Nihonkai Math. J., Tome 17 (2006) no. 1, pp. 187-197. http://gdmltest.u-ga.fr/item/1273587701/