Vu, Doan. “Gemological Characteristics of Sapphire from Hong Liem, Ham Thuan Bac District, Binh Thuan Province, Viet Nam”. VNUHCM Journal of Advanced Research in Natural Sciences 4, no. 1 (April 10, 2020): 412-420. Accessed April 7, 2026. https://arns.vnuhcmjournal.com.vn/index.php/arns/article/view/594.