Gao, Lulu
Li, Fei
Xu, Xiang
Liu, Yong
Funding for this research was provided by:
Chengdu University of Information Technology (KYTZ201422)
Article History
Received: 31 January 2018
Revised: 27 February 2018
Accepted: 6 March 2018
First Online: 2 April 2018