Knowledge representation and problem solving in the intelligent computer algebra system STRAMS. Annual of Sofia University St. Kliment Ohridski. Faculty of Mathematics and Informatics, [S. l.], v. 91, p. 193–202, 1999. Disponível em: https://annual.uni-sofia.bg/index.php/fmi/article/view/278. Acesso em: 11 jan. 2026.