SUZUKI, Tomonari; TAKAHASHI, Wataru. Fixed point theorems and characterizations of metric completeness. Topological Methods in Nonlinear Analysis, [S. l.], v. 8, n. 2, p. 371–382, 1996. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1996.040. Acesso em: 8 jul. 2025.