@article{GDZPPN002207508,
title = {Binary forms and unramified An-extensions of quadratic fields.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {405},
year = {1990},
pages = {167-178},
zbl = {0693.12008},
url = {http://dml.mathdoc.fr/item/GDZPPN002207508}
}
Nakagawa, Jin. Binary forms and unramified An-extensions of quadratic fields.. Journal für die reine und angewandte Mathematik, Tome 405 (1990) pp. 167-178. http://gdmltest.u-ga.fr/item/GDZPPN002207508/