@article{1256052386,
author = {Beidleman, J. C. and Spencer, A. E.},
title = {The normal index of maximal subgroups in finite groups},
journal = {Illinois J. Math.},
volume = {16},
number = {1},
year = {1972},
pages = { 95-101},
language = {en},
url = {http://dml.mathdoc.fr/item/1256052386}
}
Beidleman, J. C.; Spencer, A. E. The normal index of maximal subgroups in finite groups. Illinois J. Math., Tome 16 (1972) no. 1, pp. 95-101. http://gdmltest.u-ga.fr/item/1256052386/