Publisher： 国家哲学社会科学学术期刊数据库

E-ISSN： 1002-6487|volume|2|33-36

ISSN： 1002-6487

Source： 统计与决策, Vol.volume, Iss.2, 2017-01, pp. : 33-36

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