Geodesic
The number of real quadratic fields having units of negative norm.
Experimental mathematics, Tome 2 (1993) no. 2, pp. 121-136.

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Keywords: 4-class group, density of discriminants of quadratic fields, Pell equation, Redei matrices 
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     author = {Stevenhagen, Peter},
     title = {The number of real quadratic fields having units of negative norm.},
     journal = {Experimental mathematics},
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Stevenhagen, Peter. The number of real quadratic fields having units of negative norm.. Experimental mathematics, Tome 2 (1993) no. 2, pp. 121-136. http://geodesic.mathdoc.fr/item/EXMA_1993__2_2_230043/