@article{1178245011, author = {Umegaki, Hisaharu}, title = {Conditional expectation in an operator algebra, II}, journal = {Tohoku Math. J. (2)}, volume = {8}, number = {3}, year = {1956}, pages = { 86-100}, language = {en}, url = {http://dml.mathdoc.fr/item/1178245011} }
Umegaki, Hisaharu. Conditional expectation in an operator algebra, II. Tohoku Math. J. (2), Tome 8 (1956) no. 3, pp. 86-100. http://gdmltest.u-ga.fr/item/1178245011/