Cao, Dung, Thon Nguyen, and Van Tran. 2018. “Synthesis of NaYF4 Doped With Eu3+ions by Hydrothermal Method for the Application in the Security Printing”. Science & Technology Development Journal: Natural Sciences 1 (6), 185-91. https://doi.org/https://doi.org/10.32508/stdjns.v1i6.628.