“110 Anniversary of the Faculty of Mathematics and Informatics at the Sofia University ‘St. Kl. Ohridski’ (in Bulgarian)” (2001) Annual of Sofia University St. Kliment Ohridski. Faculty of Mathematics and Informatics, 93, pp. 5–24. Available at: https://annual.uni-sofia.bg/index.php/fmi/article/view/198 (Accessed: 17 March 2026).