L. Thi Kim Dung, N. Vinh Phu, N. Nhu Y, and N. Minh Hoa, “SYNTHESIS AND OPTICAL PROPERTIES OF NITROGEN-DOPED CARBON QUANTUM DOTS”, HNUEJS.NS, vol. 70, no. 2, pp. 70–77, Jun. 2025, doi: 10.18173/2354-1059.2025-0022.