GORBACHUK, V. M. On approximation of solutions of operator-differential equations with their entire solutions of exponential type. Methods of Functional Analysis and Topology, [S. l.], v. 22, n. 3, p. 245–255, 2016. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/639. Acesso em: 16 dec. 2025.