Kamal Akhball, Shahrul Izwan, and Hasliza Hassan. “Energy Efficient Arithmetic Logic Unit (ALU) Based On Dynamic Voltage and Frequency Scaling (DVFS)”. Evolution in Electrical and Electronic Engineering, vol. 2, no. 1, May 2021, pp. 10-19, https://penerbit.uthm.edu.my/periodicals/index.php/eeee/article/view/1716.