Do Thanh Hieu, Tran Xuan Tien, Nguyen Van Nhan, and Ngo Van Tuan. “SUPPRESSION OF THE DC COMPONENT IN GRID INJECTION CURRENT FOR PHOTOVOLTAIC GRID-TIED INVERTERS”. UTEHY Journal of Applied Science and Technology, Vol. 23, Oct. 2019, pp. 25-30, http://jst.utehy.edu.vn/index.php/jst/article/view/47.