@article{GDZPPN002194597,
title = {Quadratic unramified extensions of Q (... d).},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {302},
year = {1978},
pages = {108-111},
zbl = {0393.12004},
url = {http://dml.mathdoc.fr/item/GDZPPN002194597}
}
Gogia, Sudesh K.; Luthar, S. Quadratic unramified extensions of Q (... d).. Journal für die reine und angewandte Mathematik, Tome 302 (1978) pp. 108-111. http://gdmltest.u-ga.fr/item/GDZPPN002194597/