Life and works of Dimiter Skordev. Annual of Sofia University St. Kliment Ohridski. Faculty of Mathematics and Informatics, [S. l.], v. 109, p. 19–40, 2022. DOI: 10.60063/gsu.fmi.109.19-40. Disponível em: https://annual.uni-sofia.bg/index.php/fmi/article/view/560. Acesso em: 14 dec. 2025.