Munkholm, Hans Jorgen. “Borsuk-Ulam Type Theorems for Proper $Z_p$-Actions on (Mod $p$ Homology) $n$-Spheres”. Mathematica Scandinavica 24 (December 1, 1969): 167–185. Accessed July 25, 2026. https://journals.msp.org/mscand/article/view/2372.