70th anniversary of Todor Genchev (1932-1998). Annual of Sofia University St. Kliment Ohridski. Faculty of Mathematics and Informatics, [S. l.], v. 95, p. 7–9, 2003. Disponível em: https://annual.uni-sofia.bg/index.php/fmi/article/view/172. Acesso em: 11 jan. 2026.