K. Z., Kayiita. “UMBRAL CALCULUS AND SHEFFER THEORY: A UNIFIED ALGEBRAIC FRAMEWORK”. AFRICAN JOURNAL OF SCIENCE, TECHNOLOGY AND ENGINEERING (AJSTE) 7, no. 1 (August 5, 2026): 42-48. Accessed September 22, 2026. https://journal.kyu.ac.ke/index.php/library1/article/view/179.