WILLIAMS, K. S. Forms Representable by an Integral Positive-Definite Binary Quadratic Form. MATHEMATICA SCANDINAVICA, [S. l.], v. 29, p. 73–86, 1971. DOI: 10.7146/math.scand.a-11036. Disponível em: https://www.mscand.dk/article/view/11036. Acesso em: 28 apr. 2024.