%0 Journal Article %A Hourong Qin %T The 4-rank of $K₂O_F$ for real quadratic fields F %J Acta Arithmetica %D 1995 %P 323-333 %V 72 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/aa-72-4-323-333/ %R 10.4064/aa-72-4-323-333 %G en %F 10_4064_aa_72_4_323_333