Khalil, Fazli A., et al. “Solar Tracking Techniques and Implementation in Photovoltaic Power Plants: A Review: Solar Tracking Techniques and Implementation in Photovoltaic Power Plants”. Proceedings of the Pakistan Academy of Sciences: A. Physical and Computational Sciences, vol. 54, no. 3, Apr. 2021, pp. 231–241, http://ppaspk.org/index.php/PPAS-A/article/view/236.