Sun, Min
Liu, Jing
Funding for this research was provided by:
the foundation of Scientific Research Project of Shandong Universities (J15LI11)
the foundation of National Natural Science Foundation of China (No. 11601475, 11671228)
the foundation of First Class Discipline of Zhejiang-A (Zhejiang University of Finance and Economics- Statistics)
the foundation of National Natural Science Foundation of Shandong Province (No. zr2016al05)