QUANTIZATION RESEARCH ON CHINA'S SAND & CLAY ORES MANAGING POLICIES VIEWING FROM PERSPECTIVE OF POLICY TOOL 
LIU Wenying, ZHAO Lianrong, WU Qi.
Resources & Industries . 2018, (1): 21 -27 .  DOI: 10.13776/j.cnki.resourcesindustries.20180212.006

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