GORBACHUK, V. M. On solutions of parabolic and elliptic type differential equations on $(-\infty, \infty)$ in a Banach space. Methods of Functional Analysis and Topology, [S. l.], v. 14, n. 2, p. 177–183, 2008. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/381. Acesso em: 18 dec. 2025.