Vo Thi Huong, Nguyen Ngoc Quang, Chu Thi Thanh Tho, Pham Ngoc Thang and Do Thanh Hieu 2018. AN IMPROVED P&O MAXIMUM POWER POINT TRACKING METHOD FOR PHOTOVOLTAIC SYSTEMS UNDER RAPIDLY CHANGING IRRADIANCE CONDITIONS. UTEHY Journal of Applied Science and Technology. 19, (Oct. 2018), 22-28.