CHEN, Z.-X.; YANG, C.-C. On the zeros and hyper-order of meromorphic solutions of linear differential equations. Annales Fennici Mathematici, [S. l.], v. 24, n. 1, p. 215–224, 1999. Disponível em: https://afm.journal.fi/article/view/134950. Acesso em: 25 nov. 2024.