Quantitative Determination of Free Radical Content in Coal by Standard Curve Method
ZHENG Rong-Ping, PAN Tie-Ying, SHI Xin-Mei, ZHOU Li-Fang, LIU Rui-Min, ZHANG De-Xiang, GAO Jin-Sheng 
Chinese Journal of Magnetic Resonance . 2011, (2): 259 -264 .