@article{1250128328,
author = {Gross, Fletcher and Berger, T. R.},
title = {A universal example of a core-free permutable subgroup},
journal = {Rocky Mountain J. Math.},
volume = {12},
number = {4},
year = {1982},
pages = { 345-366},
language = {en},
url = {http://dml.mathdoc.fr/item/1250128328}
}
Gross, Fletcher; Berger, T. R. A universal example of a core-free permutable subgroup. Rocky Mountain J. Math., Tome 12 (1982) no. 4, pp. 345-366. http://gdmltest.u-ga.fr/item/1250128328/