@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/