Zhang, Z., Pang, W., Zhang, L., Jiao, P., & Wang, X. (2017). Mineral Composition and Brittleness of Lower Cambrian Niutitang Formation Shale in Northwest Hunan. Journal of Mines, Metals and Fuels, 65(10), 556–562. https://doi.org/10.18311/jmmf/2017/26968