Oanh, L., 		Hanh, P., 		Can, D., & 		Hoang, L.
(2010).
 Classific ation of natural tourmalines using near- infrared absorption spectroscopy.
<em>VNU Journal Of Science: Mathematics - Physics, 26</em>(4).
Retrieved from <a href="https://js.vnu.edu.vn/MaP/article/view/2733" target="_new">https://js.vnu.edu.vn/MaP/article/view/2733</a>