WANG, James Li-ming. An Approximate Taylor’s Theorem for $R(X)$. Mathematica Scandinavica, Berkeley, CA, United States, v. 33, p. 343–358, 1973. DOI: 10.7146/math.scand.a-11496. Disponível em: https://journals.msp.org/mscand/article/view/2171. Acesso em: 25 jul. 2026.