Auwalu, Abba, and Evren Hincal. “Some Fixed Point Theorems for Expansive Mappings in Cone Pentagonal Metric Spaces”. Journal of Informatics and Mathematical Sciences 9, no. 1 (June 9, 2017): 111–122. Accessed November 25, 2024. http://rgnpublications.com/journals/index.php/jims/article/view/581.