@article{1256053747,
author = {Snapper, Ernst},
title = {Normal subsets of finite group},
journal = {Illinois J. Math.},
volume = {13},
number = {4},
year = {1969},
pages = { 155-164},
language = {en},
url = {http://dml.mathdoc.fr/item/1256053747}
}
Snapper, Ernst. Normal subsets of finite group. Illinois J. Math., Tome 13 (1969) no. 4, pp. 155-164. http://gdmltest.u-ga.fr/item/1256053747/