Eke, K. S., H. O. Olaoluwa, and J. O. Olaleru. “Common Fixed Point Results for Asymptotic Quasi-Contraction Mappings in Quasi-Metric Spaces”. International Journal of Mathematical Sciences and Optimization: Theory and Applications, Vol. 10, no. 1, Mar. 2024, pp. 115 -27, http://ijmso.unilag.edu.ng/article/view/2067.