ABBAS, M.; PARVANEH, V.; RAZANI, A. A common fixed point for generalized (ψ, φ)f,g - weak contractions. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 63, n. 11, p. 1544–1554, 2011. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2824. Acesso em: 5 dec. 2025.