Thanrak, Chotitham, and Sasalak Tongkaw. 2020. “Mathematical Model for Approximation the Efficiency of Parallel Computing on Single Board Cluster With Least-Squares Approximation”. International Journal of Integrated Engineering 12 (7): 181-86. https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/7269.