@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/