H. M. Thao, T. T. Hien, D. D. Anh and P. T. Nga, Mineralogical characteristics of graphite ore from Bao Ha deposit, Lao Cai Province and proposing a wise use, Vietnam J. Earth Sci. 39 (2017) 324–336. DOI: https://doi.org/10.15625/0866-7187/39/4/10728.