XU, Hong-Yan; YI, Cai-Feng; CAO, Ting-Bin. The uniqueness problem for meromorphic functions in the unit disc sharing values and a set in an angular domain. Mathematica Scandinavica, Berkeley, CA, United States, v. 109, n. 2, p. 240–252, 2011. DOI: 10.7146/math.scand.a-15187. Disponível em: https://journals.msp.org/mscand/article/view/510. Acesso em: 24 jul. 2026.