K. Z., K. (2026) “UMBRAL CALCULUS AND SHEFFER THEORY: A UNIFIED ALGEBRAIC FRAMEWORK”, AFRICAN JOURNAL OF SCIENCE, TECHNOLOGY AND ENGINEERING (AJSTE) , 7(1), pp. 42-48. Available at: https://journal.kyu.ac.ke/index.php/library1/article/view/179 (Accessed: 22September2026).