WANG, James Li-ming. An Approximate Taylor’s Theorem for $R(X)$. MATHEMATICA SCANDINAVICA, [S. l.], v. 33, p. 343–358, 1973. DOI: 10.7146/math.scand.a-11496. Disponível em: https://tidsskrift.dk/math/article/view/11496. Acesso em: 14 aug. 2026.