M. K. A. Mahmood, Z. Ismail Khan, M. S. A. Megat Ali, A. I. Mohd Yassin, N. Ismail Khan, and M. K. Y. Tan, “Quantitative Assessment of Coffee Quality Using Microwave Non-Destructive Testing”, IIUMEJ, vol. 27, no. 2, pp. 129–145, May 2026.