KARLSSON, P. W. Some Hypergeometric Transformations and Generating Functions. MATHEMATICA SCANDINAVICA, [S. l.], v. 33, p. 193–204, 1973. DOI: 10.7146/math.scand.a-11483. Disponível em: https://www.mscand.dk/article/view/11483. Acesso em: 6 may. 2024.