@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/