1.
KUPERBERG, Krystyna M., KUPERBERG, Włodzimierz, MINC, Piotr and REED, Coke S. Examples related to Ulam’s fixed point problem. Topological Methods in Nonlinear Analysis. Online. 1 March 1993. Vol. 1, no. 1, pp. 173 - 181. [Accessed 3 July 2024].