@article{1138843772, author = {Nakamura, Masahiro and Umegaki, Hisaharu}, title = {On a proposition of von Neumann}, journal = {Kodai Math. Sem. Rep.}, volume = {8}, number = {1}, year = {1956}, pages = { 142-144}, language = {en}, url = {http://dml.mathdoc.fr/item/1138843772} }
Nakamura, Masahiro; Umegaki, Hisaharu. On a proposition of von Neumann. Kodai Math. Sem. Rep., Tome 8 (1956) no. 1, pp. 142-144. http://gdmltest.u-ga.fr/item/1138843772/