Zhang, Zhen, Wen Pang, Linting Zhang, Peng Jiao, and Xikai Wang. 2017. “Mineral Composition and Brittleness of Lower Cambrian Niutitang Formation Shale in Northwest Hunan”. Journal of Mines, Metals and Fuels 65 (10):556-62. https://doi.org/10.18311/jmmf/2017/26968.