GOULD, H. W. Fjeldstad’s Series and the $q$-Analog of a Series of Dougall. Mathematica Scandinavica, Berkeley, CA, United States, v. 8, p. 198–200, 1960. DOI: 10.7146/math.scand.a-10609. Disponível em: https://journals.msp.org/mscand/article/view/2741. Acesso em: 25 jul. 2026.