110 Anniversary of the Faculty of Mathematics and Informatics at the Sofia University "St. Kl. Ohridski" (in Bulgarian). Annual of Sofia University St. Kliment Ohridski. Faculty of Mathematics and Informatics, [S. l.], v. 93, p. 5–24, 2001. Disponível em: https://annual.uni-sofia.bg/index.php/fmi/article/view/198. Acesso em: 11 jan. 2026.