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, Berkeley, CA, United States, v. 60, p. 52–62, 1987. DOI: 10.7146/math.scand.a-12171. Disponível em: https://journals.msp.org/mscand/article/view/1454. Acesso em: 25 jul. 2026.