Chidume, C.E., and M.E. Okpala. 2014. “ON A GENERAL CLASS OF MULTI-VALUED STRICTLY PSEUDOCONTRACTIVE MAPPINGS”. Journal of Nonlinear Analysis and Optimization: Theory & Applications (JNAO) 5 (2):7-20. https://ph03.tci-thaijo.org/index.php/jnao/article/view/2746.