TEAM, S. A Simple Proof of Caristi’s Fixed Point Theorem without Using Zorn’s Lemma and Transfinite Induction: Wei-Shih Du. Thai Journal of Mathematics, [S. l.], v. 14, n. 2, p. 259–264, 2016. Disponível em: https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/595. Acesso em: 1 may. 2024.