Jiang, Jiqiang
Liu, Lishan
Funding for this research was provided by:
the National Natural Science Foundation of China (11371221)
the Natural Science Foundation of Shandong Province of China (ZR2014AL004, ZR2013AQ014)
the Project of Shandong Province Higher Educational Science and Technology Program (J14LI08, J13LI08)
Doctoral Scientific Research Foundation of Qufu Normal University and Youth Foundation of Qufu Normal University (BSQD20130140)