Pan, Renfang, Huanhuan Gao, Kehui Lei, and Zhengping Zhu. 2015. “Quantitative Prediction of Coalbed Gas Content Based on Seismic Multiple-Attribute Analyses”. Journal of Engineering and Technological Sciences 47 (4):447-62. https://doi.org/10.5614/j.eng.technol.sci.2015.47.4.7.