1. Goldstein, L.J. On prime discriminants, Nagoya Math J. 45 (1971), 119–127.
2. Lagarias, J.C. Signatures of units and congruences (mod 4) in certain real quadratic fields, J. Reine Angew. 301 (1978), 142–146.
3. Lagarias, J.C. Signatures of units and congruences (mod 4) in certain real quadratic fields II, J. Reine Angew. (to appear).
4. Sunley, J.S. Remarks concerning generalized prime discriminants, Proc. of the 1972 Number Theory Conference; University of Colorado; Boulder, Colorado; 233–237.