Publisher： 国家哲学社会科学学术期刊数据库

E-ISSN： 1002-9605|35|3|31-34

ISSN： 1002-9605

Source： 煤炭经济研究, Vol.35, Iss.3, 2015-01, pp. : 31-34

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

Previous Menu Next