Vaivudh, S., W. Rakwichian, S. Chindaruksa, and N. Sriprang. “Heat Transfer of Charging and Discharging Experiment of High Thermal Energy Storage System by Thermal Oil as Heat Transfer Fluid”. Journal of Renewable Energy and Smart Grid Technology, vol. 1, no. 2, Dec. 2014, pp. 15-22, https://ph01.tci-thaijo.org/index.php/RAST/article/view/25971.