1. Integral quadratic forms;Watson,1960
2. G. Lejeune Dirichlet, Werke I, pp. 65–98, 197–218, and 221–236.
3. Discriminantal divisors of binary quadratic forms;Pall;J. Number Theory,1969
4. Ein rationales biquadratisches Reziprozitätsgesetz;Burde;J. Reine Angew. Math.,1969
5. The power of 2 dividing the class number of a binary quadratic discriminant;Brown;J. Number Theory,1973