@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/