Umar , D. and Bichi , S. L. (2024) “On the Existence of Solutions of Multi-Term Fractional Order Volterra Integro-Differential Equations”, International Journal of Mathematical Sciences and Optimization: Theory and Applications, 10(4), pp. 99 - 113. Available at: http://ijmso.unilag.edu.ng/article/view/2392 (Accessed: 19April2025).