@article{1102735526, author = {Ch\=o, Muneo and Takaguchi, Makoto}, title = {Boundary points of joint numerical ranges.}, journal = {Pacific J. Math.}, volume = {97}, number = {2}, year = {1981}, pages = { 27-35}, language = {en}, url = {http://dml.mathdoc.fr/item/1102735526} }
Chō, Muneo; Takaguchi, Makoto. Boundary points of joint numerical ranges.. Pacific J. Math., Tome 97 (1981) no. 2, pp. 27-35. http://gdmltest.u-ga.fr/item/1102735526/