@article{1138844786,
author = {Umegaki, Hisaharu},
title = {A functional method on amount of entropy},
journal = {Kodai Math. Sem. Rep.},
volume = {15},
number = {1},
year = {1963},
pages = { 162-175},
language = {en},
url = {http://dml.mathdoc.fr/item/1138844786}
}
Umegaki, Hisaharu. A functional method on amount of entropy. Kodai Math. Sem. Rep., Tome 15 (1963) no. 1, pp. 162-175. http://gdmltest.u-ga.fr/item/1138844786/