@article{GDZPPN002210746,
title = {On the maximal unramified p-extension of an algebraic number field.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {435},
year = {1993},
pages = {129-156},
zbl = {0779.11054},
url = {http://dml.mathdoc.fr/item/GDZPPN002210746}
}
Wingberg, Kay. On the maximal unramified p-extension of an algebraic number field.. Journal für die reine und angewandte Mathematik, Tome 435 (1993) pp. 129-156. http://gdmltest.u-ga.fr/item/GDZPPN002210746/