@article{GDZPPN002109220, title = {Groups generated by k-root subgroups.}, journal = {Inventiones mathematicae}, volume = {104}, year = {1991}, pages = {575-666}, zbl = {0794.20057}, url = {http://dml.mathdoc.fr/item/GDZPPN002109220} }
Timmesfeld, F.G. Groups generated by k-root subgroups.. Inventiones mathematicae, Tome 104 (1991) pp. 575-666. http://gdmltest.u-ga.fr/item/GDZPPN002109220/