@article{1256067885, author = {Heineken, Hermann}, title = {Commutator closed groups}, journal = {Illinois J. Math.}, volume = {9}, number = {4}, year = {1965}, pages = { 242-255}, language = {en}, url = {http://dml.mathdoc.fr/item/1256067885} }
Heineken, Hermann. Commutator closed groups. Illinois J. Math., Tome 9 (1965) no. 4, pp. 242-255. http://gdmltest.u-ga.fr/item/1256067885/