YAMASHITA, Shinji. Functions with $H^p$ hyperbolic derivative. Mathematica Scandinavica, Berkeley, CA, United States, v. 53, p. 238–244, 1983. DOI: 10.7146/math.scand.a-12031. Disponível em: https://journals.msp.org/mscand/article/view/1638. Acesso em: 25 jul. 2026.