Algorithm of construction of the type and its realization in the language W. Annual of Sofia University St. Kliment Ohridski. Faculty of Mathematics and Informatics, [S. l.], v. 88, p. 459–483, 1996. Disponível em: https://annual.uni-sofia.bg/index.php/fmi/article/view/400. Acesso em: 15 dec. 2025.