GIRRAJ KUMAR VERMA, A. K. S. K. S. . ?-?-Contraction mapping in complete b-metric spaces. Mathematical Statistician and Engineering Applications, [S. l.], v. 70, n. 1, p. 821–825, 2021. DOI: 10.17762/msea.v70i1.2737. Disponível em: https://www.philstat.org/index.php/MSEA/article/view/2737. Acesso em: 17 may. 2024.