@article{1077466129,
author = {Bram, Joseph},
title = {Subnormal operators},
journal = {Duke Math. J.},
volume = {22},
number = {1},
year = {1955},
pages = { 75-94},
language = {en},
url = {http://dml.mathdoc.fr/item/1077466129}
}
Bram, Joseph. Subnormal operators. Duke Math. J., Tome 22 (1955) no. 1, pp. 75-94. http://gdmltest.u-ga.fr/item/1077466129/