@article{GDZPPN002418266, title = {Normal and Power Endomorphisms of a Group.}, journal = {Mathematische Zeitschrift}, volume = {147}, year = {1976}, pages = {139-142}, zbl = {0324.20044}, url = {http://dml.mathdoc.fr/item/GDZPPN002418266} }
Newell, Martin L. Normal and Power Endomorphisms of a Group.. Mathematische Zeitschrift, Tome 147 (1976) pp. 139-142. http://gdmltest.u-ga.fr/item/GDZPPN002418266/