@article{1178243551, author = {Yoshino, Takashi}, title = {On the spectrum of a hyponormal operator}, journal = {Tohoku Math. J. (2)}, volume = {17}, number = {4}, year = {1965}, pages = { 305-309}, language = {en}, url = {http://dml.mathdoc.fr/item/1178243551} }
Yoshino, Takashi. On the spectrum of a hyponormal operator. Tohoku Math. J. (2), Tome 17 (1965) no. 4, pp. 305-309. http://gdmltest.u-ga.fr/item/1178243551/