Granas, Andrzej, and Jan W. Jaworowski. “Reminiscences of Karol Borsuk”. Topological Methods in Nonlinear Analysis 1, no. 1 (March 1, 1993): 3–8. Accessed April 25, 2024. https://apcz.umk.pl/TMNA/article/view/TMNA.1993.002.