@article{GDZPPN002229889, title = {Unramified Kummer extensions of prime power degree.}, journal = {Manuscripta mathematica}, volume = {64}, year = {1989}, pages = {261-290}, zbl = {0705.13004}, url = {http://dml.mathdoc.fr/item/GDZPPN002229889} }
Greither, C. Unramified Kummer extensions of prime power degree.. Manuscripta mathematica, Tome 64 (1989) pp. 261-290. http://gdmltest.u-ga.fr/item/GDZPPN002229889/