PHANEENDRA, T. BANACH AND KANNAN CONTRACTIONS ON S-METRIC SPACE. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 39, p. 243–247, 2018. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/6933. Acesso em: 7 oct. 2026.