Chidume, C. E., and J. O. . Olaleru. “Picard Iteration Process For A General Class Of Contractive Mappings”. Journal of the Nigerian Mathematical Society, vol. 33, no. 1-3, Apr. 2021, pp. 19-23, https://ojs.ictp.it/jnms/index.php/jnms/article/view/705.