ON THE EXTENDABILITY OF GRIESMER ARCS. Annual of Sofia University St. Kliment Ohridski. Faculty of Mathematics and Informatics, [S. l.], v. 101, p. 183–192, 2013. Disponível em: https://annual.uni-sofia.bg/index.php/fmi/article/view/238. Acesso em: 15 dec. 2025.