@article{1138843331,
author = {Umegaki, Hisaharu},
title = {Operator algebra of finite class. II.},
journal = {Kodai Math. Sem. Rep.},
volume = {5},
number = {1},
year = {1953},
pages = { 61-63},
language = {en},
url = {http://dml.mathdoc.fr/item/1138843331}
}
Umegaki, Hisaharu. Operator algebra of finite class. II.. Kodai Math. Sem. Rep., Tome 5 (1953) no. 1, pp. 61-63. http://gdmltest.u-ga.fr/item/1138843331/