Okeke, odwin Amechi, and Johnson O Olaleru. “Existence of Fixed Points of Certain Classes of Nonlinear Mappings”. International Journal of Mathematical Modelling & Computations 4, no. 4 (March 21, 2014): 357–364. Accessed May 9, 2026. http://oiccpress.com/ijm2c/article/view/11231.