@article{GDZPPN002190303,
title = {On 2-rank of the ideal class groups of algebraic number fields.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {272},
year = {1975},
pages = {165-169},
zbl = {0299.12009},
url = {http://dml.mathdoc.fr/item/GDZPPN002190303}
}
Ishida, Makoto. On 2-rank of the ideal class groups of algebraic number fields.. Journal für die reine und angewandte Mathematik, Tome 272 (1975) pp. 165-169. http://gdmltest.u-ga.fr/item/GDZPPN002190303/