The Chowla-Selberg formula for genera James G. Huard, Pierre Kaplan, Kenneth S. Williams (1995) Acta Arithmetica
The class number of pairs of positive-definite binary quadratic forms Kenneth Hardy, Kenneth Williams (1989) Acta Arithmetica
The genus of the Barnes-Wall lattice. Rudolf Scharlau, Boris B. Venkov (1994) Commentarii mathematici Helvetici
Théorème concernant les nombres entiers ≡ 5 ( mod. 12 ) . Liouville, J. (1869) Journal de Mathématiques Pures et Appliquées