Alemayehu Geremew Negash,  Common Fixed Point Theorems for Co-Cyclic Weak Contractions in Compact Metric.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    February 2014, vol. 86(2). 411 - 413
    [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/9997731.