TY  - JOUR
AU  - Stevenhagen, Peter
TI  - The number of real quadratic fields having units of negative norm.
JO  - Experimental mathematics
PY  - 1993
SP  - 121
EP  - 136
VL  - 2
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/EXMA_1993__2_2_230043/
LA  - en
ID  - EXMA_1993__2_2_230043
ER  -