Khadshiivanov N, Nikiforov V. On the theorems of Borsuk-Ulman and Ljusternik-Shnirelman-Borsuk. Ann. Sofia Univ. Fac. Math. and Inf. [Internet]. 1993 Dec. 12 [cited 2024 Nov. 24];84:83-9. Available from: https://ftl5.uni-sofia.bg./index.php/fmi/article/view/471