Landjev, Ivan, and Assia Rousseva. “ON THE EXTENDABILITY OF GRIESMER ARCS”. Ann. Sofia Univ. Fac. Math. and Inf. 101 (December 12, 2013): 183–192. Accessed November 21, 2024. https://ftl5.uni-sofia.bg/index.php/fmi/article/view/238.