COHN, J. H. E. Squares in arithmetical progressions I. Mathematica Scandinavica, Berkeley, CA, United States, v. 52, p. 5–19, 1983. DOI: 10.7146/math.scand.a-11988. Disponível em: https://journals.msp.org/mscand/article/view/1633. Acesso em: 25 jul. 2026.