AHERN, P. R.; CLARK, D. N. Radial nth Derivatives of Blaschke Products. Mathematica Scandinavica, Berkeley, CA, United States, v. 28, p. 189–201, 1971. DOI: 10.7146/math.scand.a-11015. Disponível em: https://journals.msp.org/mscand/article/view/2281. Acesso em: 25 jul. 2026.