A reducibility in the theory of iterative combinatory spaces. Annual of Sofia University St. Kliment Ohridski. Faculty of Mathematics and Informatics, [S. l.], v. 98, p. 87–99, 2008. Disponível em: https://annual.uni-sofia.bg/index.php/fmi/article/view/131. Acesso em: 14 dec. 2025.