H. N. Van, B. T. Hoan, N. Duy-Hung, P. D. Tam, N. T. Khoi, C. X. Thang and P. Vuong-Hung, Red light emission of Mn doped beta-tricalcium phosphate -Ca3(PO4)2, VJChem 55 (2017) 633. DOI: https://doi.org/10.15625/2525-2321.2017-00521.