ZHANG, Guowei. Limiting direction of Julia sets and infinite radial order of solutions to complex linear differential equations. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 43, p. 213–223, 2020. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/7354. Acesso em: 6 nov. 2026.