Wei, Li
Agarwal, Ravi P
Funding for this research was provided by:
National Natural Science Foundation of China (11071053)
Natural Science Foundation of Hebei Province (A2014207010)
Key Project of Science and Research of Hebei Educational Department (ZH2012080)
Key Project of Science and Research of Hebi Unversity of Economics and Business (2015KYZ03)
Article History
Received: 25 July 2015
Accepted: 22 December 2015
First Online: 7 January 2016