Nguyen Ngoc Minh, Bui Van Dan, Luong Xuan Dien, Phan Si Nguyen, and Ngo Duc Quan. 2021. “EFFECT OF K-EXCESS ON ENERGY STORAGE DENSITY AND EFFICIENCY OF Bi0.5K0.5+xTiO3 FILMS”. UTEHY Journal of Science and Technology 28 (April), 91-96. http://tapchi.utehy.edu.vn/index.php/jst/article/view/415.