GEFTER, S. L.; PIVEN’, A. L. Entire solutions of one linear implicit differential-difference equation in Banach spaces. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 70, n. 8, p. 1044–1057, 2018. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1616. Acesso em: 5 dec. 2025.