@article{GDZPPN002407833,
title = {The Number of Conjugacy Classes in a Finite Group.},
journal = {Mathematische Zeitschrift},
volume = {114},
year = {1970},
pages = {175-179},
zbl = {0221.20006},
url = {http://dml.mathdoc.fr/item/GDZPPN002407833}
}
Gallagher, Patrick X. The Number of Conjugacy Classes in a Finite Group.. Mathematische Zeitschrift, Tome 114 (1970) pp. 175-179. http://gdmltest.u-ga.fr/item/GDZPPN002407833/