DAI, J. A note on differences of composition operators acting on the Hardy space. MATHEMATICA SCANDINAVICA, [S. l.], v. 128, n. 2, 2022. DOI: 10.7146/math.scand.a-129748. Disponível em: https://www.mscand.dk/article/view/129748. Acesso em: 6 dec. 2022.