Bình, Nguyễn Văn. “NGHIÊN CỨU VỀ TOURMALIN Ở HOẰNG HÓA, THANH HÓA”. Vietnam Journal of Earth Sciences 27, no. 1 (March 25, 2017): 78–81. Accessed November 8, 2025. http://vjes.vast.vn/jse/article/view/9393.