Bahrudin, M. S., Y. Yusoff, S. F. Abdullah, A. W. Mahmood Zuhdi, N. Amin, and I. Ahmad. “An Innovative Parametric Optimization Using Taguchi Method for Cu(In,Ga)(S,Se)2 Thin Film Solar Cell Device Simulation”. Journal of Energy and Environment, Vol. 12, no. 2, Dec. 2020, http://journal.uniten.edu.my/newojs/index.php/jee/article/view/207.