Long, V., Pardieu, G., Giuliani, P., & Pham Van Long, V. (2013). Update on Gemstone Mining in Luc Yen, Vietnam. Gems & Gemology, 49(4), 233-245. Link to Article
A New Find of Danburite in the Luc Yen Mining Area, Vietnam
Huong, L. T. T., Otter, L. M., Häger, T., Ullmann, T., Hofmeister, W., Weis, U., & Jochum, K. P. (2016). A New Find of Danburite in the Luc Yen Mining Area, Vietnam. Gems & Gemology, 52(4). Link to Article