CARLITZ, L. A note on exponential sums. Mathematica Scandinavica, Berkeley, CA, United States, v. 42, p. 39–48, 1978. DOI: 10.7146/math.scand.a-11734. Disponível em: https://journals.msp.org/mscand/article/view/1915. Acesso em: 25 jul. 2026.