PIĄTEK, B.; ESPÍNOLA, R. Fixed points and non-convex sets in CAT(0) spaces. Topological Methods in Nonlinear Analysis, [S. l.], v. 41, n. 1, p. 135–162, 2013. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2013.006. Acesso em: 12 dec. 2024.