Barcz, Eugeniusz. “On the Two-Dimensional Version of the Sperner Lemma and Brouwer’s Theorem”. Annales Mathematicae Silesianae 36, no. 2 (September 8, 2022): 106-114. Accessed November 21, 2024. https://journals.us.edu.pl/index.php/AMSIL/article/view/14550.