@article{1102970258,
author = {Embry, Mary R.},
title = {Classifying special operators by means of subsets associated with the numerical range.},
journal = {Pacific J. Math.},
volume = {39},
number = {3},
year = {1971},
pages = { 61-65},
language = {en},
url = {http://dml.mathdoc.fr/item/1102970258}
}
Embry, Mary R. Classifying special operators by means of subsets associated with the numerical range.. Pacific J. Math., Tome 39 (1971) no. 3, pp. 61-65. http://gdmltest.u-ga.fr/item/1102970258/