Xia, Hui
Zhang, Rui-hua
Yu, Jia
Pan, Zhen-kuan
Funding for this research was provided by:
the Natural Science Foundation of China (NSFC) (61402245)
the Project funded by China Postdoctoral Science Foundation (2015T80696 and 2014M551870)
the Shandong Provincial Natural Science Foundation (ZR2014FQ010)
the Project funded by Qingdao Postdoctoral Science Foundation
the Open Project Foundation of Shandong Provincial Key Laboratory of Software Engineering (2013SE01)