Chakalov, Vladimir, and Dimiter Skordev. “Life and Scientific Achievements of Yaroslav Tagamlitzki (in Bulgarian)”. Ann. Sofia Univ. Fac. Math. and Inf. 91 (December 12, 1999): 13–19. Accessed December 4, 2024. https://stipendii.uni-sofia.bg/index.php/fmi/article/view/265.