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@article{COMIM_1998__6_1_a6, author = {Bulant, Michal}, title = {On the parity of the class number of the field $\Bbb Q(\sqrt p,\sqrt q,\sqrt r)$}, journal = {Communications in Mathematics}, pages = {41--52}, publisher = {mathdoc}, volume = {06}, number = {1}, year = {1998}, mrnumber = {1822514}, zbl = {1024.11071}, language = {en}, url = {http://geodesic.mathdoc.fr/item/COMIM_1998__6_1_a6/} }
Bulant, Michal. On the parity of the class number of the field $\Bbb Q(\sqrt p,\sqrt q,\sqrt r)$. Communications in Mathematics, Tome 06 (1998) no. 1, pp. 41-52. http://geodesic.mathdoc.fr/item/COMIM_1998__6_1_a6/