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