Khadshiivanov, N. and Nikiforov, V. (1993) “On the theorems of Borsuk-Ulman and Ljusternik-Shnirelman-Borsuk”, Ann. Sofia Univ. Fac. Math. and Inf, 84, pp. 83–89. Available at: https://annual.uni-sofia.bg/index.php/fmi/article/view/471 (Accessed: 22 November 2024).