@article{1102992969, author = {Kamowitz, Herbert}, title = {On operators whose spectrum lies on a circle or a line.}, journal = {Pacific J. Math.}, volume = {23}, number = {3}, year = {1967}, pages = { 65-68}, language = {en}, url = {http://dml.mathdoc.fr/item/1102992969} }
Kamowitz, Herbert. On operators whose spectrum lies on a circle or a line.. Pacific J. Math., Tome 23 (1967) no. 3, pp. 65-68. http://gdmltest.u-ga.fr/item/1102992969/