@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/