KUPERBERG, K. M.; KUPERBERG, W.; MINC, P.; REED, C. S. Examples related to Ulam’s fixed point problem. Topological Methods in Nonlinear Analysis, [S. l.], v. 1, n. 1, p. 173–181, 1993. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1993.013. Acesso em: 29 mar. 2024.