Thi Kim Chi Nguyen, Duy Hung Nguyen, Tan Vinh Le, Thanh Vu Tran, Chi Nguyen Vo, and Thi Kim Trung Pham, “Luminescence properties of Mn⁴⁺-doped CaAl₂OVJSTE, vol. 63, no. 3, pp. 3-7, Sep. 2021.