R.Krishnakumar, and D. Dhamodharan. “Common Fixed Point of Four Mapping With Contractive Modulus on Cone Banach Space”. Malaya Journal of Matematik 5, no. 02 (April 1, 2017): 310–320. Accessed July 16, 2024. https://www.malayajournal.org/index.php/mjm/article/view/596.