@article{1178230029, author = {Shiu, Elias S. W.}, title = {Numerical ranges of products and tensor products}, journal = {Tohoku Math. J. (2)}, volume = {30}, number = {4}, year = {1978}, pages = { 257-262}, language = {en}, url = {http://dml.mathdoc.fr/item/1178230029} }
Shiu, Elias S. W. Numerical ranges of products and tensor products. Tohoku Math. J. (2), Tome 30 (1978) no. 4, pp. 257-262. http://gdmltest.u-ga.fr/item/1178230029/