VERSHYNINA, A.; GEFTER, S. On holomorphic solutions of the heat equation with a Volterra operator coefficient. Methods of Functional Analysis and Topology, [S. l.], v. 13, n. 4, p. 329–332, 2007. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/360. Acesso em: 16 dec. 2025.