JACHYMSKI, J. A short proof of the converse to the contraction principle and some related results. Topological Methods in Nonlinear Analysis, [S. l.], v. 15, n. 1, p. 179–186, 2000. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2000.014. Acesso em: 26 apr. 2024.