@article{1255988490,
author = {Smith, Howard},
title = {Subnormal and ascendant subgroups with rank restrictions},
journal = {Illinois J. Math.},
volume = {34},
number = {4},
year = {1990},
pages = { 49-51},
language = {en},
url = {http://dml.mathdoc.fr/item/1255988490}
}
Smith, Howard. Subnormal and ascendant subgroups with rank restrictions. Illinois J. Math., Tome 34 (1990) no. 4, pp. 49-51. http://gdmltest.u-ga.fr/item/1255988490/