COHN, J. H. E. Squares in arithmetical progressions II. MATHEMATICA SCANDINAVICA, [S. l.], v. 52, p. 20–23, 1983. DOI: 10.7146/math.scand.a-11989. Disponível em: https://tidsskrift.dk/math/article/view/11989. Acesso em: 13 aug. 2026.