@article{1195521839,
author = {Is\'eki, Kiyoshi},
title = {A characterization of the $NB$-system},
journal = {Proc. Japan Acad.},
volume = {42},
number = {5},
year = {1966},
pages = { 871-872},
language = {en},
url = {http://dml.mathdoc.fr/item/1195521839}
}
Iséki, Kiyoshi. A characterization of the $NB$-system. Proc. Japan Acad., Tome 42 (1966) no. 5, pp. 871-872. http://gdmltest.u-ga.fr/item/1195521839/