ZHANG, R. R. Value distribution of differential-difference polynomials of meromorphic functions. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 70, n. 4, p. 471–480, 2018. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1569. Acesso em: 5 dec. 2025.