KATRE, S. A.; RAJWADE, A. R. Resolution of the sign ambiguity in the determination of the cyclotomic numbers of order 4 and the corresponding Jacobsthal sum. MATHEMATICA SCANDINAVICA, [S. l.], v. 60, p. 52–62, 1987. DOI: 10.7146/math.scand.a-12171. Disponível em: https://www.mscand.dk/article/view/12171. Acesso em: 6 may. 2024.