DIABA, F.; CHEREMNIKH, E. V. On the point spectrum of transport operator. Methods of Functional Analysis and Topology, [S. l.], v. 11, n. 1, p. 21–36, 2005. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/263. Acesso em: 16 dec. 2025.