1. J. Buchmann and H. C. Williams, On the existence of a short proof for the value of the class number and regulator of a real quadratic field, in: Richard A. Mollin (ed.), Number Theory and Applications, (NATO — Advanced Study Institute, Banff, 1988 ) Dordrecht: Kluwer, 1989, pp. 327–345.
2. H. Cohen, A Course in Computational Algebraic Number Theory, Graduate Texts in Math. 138, Berlin: Springer-Verlag, 1993.
3. H. Cohen and H. W. Lenstra, Heuristics on class groups of number fields, in: H. Jager (ed.), Number Theory (Noordwijkerhout, 1983), Lecture Notes in Math. 1068, Berlin: Springer-Verlag, 1984, pp. 33–62.
4. G. W. Fung and H. C. Williams, Compact Representation of the Fundamental Unit in a Complex Cubic Field, unpublished manuscript, 1991.
5. J. C. Lagarias, Succinct certificates for the solvability of binary quadratic polynomials, Proc. 20th IEEE Conference on Foundations of Computer Science, 1979, 47–54.