%0 Journal Article
%A Stevenhagen, Peter
%T The number of real quadratic fields having units of negative norm.
%J Experimental mathematics
%D 1993
%P 121-136
%V 2
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/EXMA_1993__2_2_230043/
%G en
%F EXMA_1993__2_2_230043