@article{1077466262,
author = {Kawada, Yukiyosi},
title = {Class formations},
journal = {Duke Math. J.},
volume = {22},
number = {1},
year = {1955},
pages = { 165-177},
language = {en},
url = {http://dml.mathdoc.fr/item/1077466262}
}
Kawada, Yukiyosi. Class formations. Duke Math. J., Tome 22 (1955) no. 1, pp. 165-177. http://gdmltest.u-ga.fr/item/1077466262/