Xavier, G. Britto Antony, T. Sathinathan, and D. Arun. “Fractional Order Riemann Zeta Factorial Function: A Recent Study”. Theory and Practice of Mathematics and Computer Science Vol. 10 (May 10, 2021): 27–33. Accessed June 13, 2026. https://stm.bookpi.org/TPMCS-V10/article/view/1073.