Chen, Hai-long
Li, Tao
Xing, Kai
Li, Kun-ling
Zhang, Mao-dong
Li, Qing-ling
Funding for this research was provided by:
Natural Science Foundation of Shandong Province in China (ZR2013EEL009)
Shandong Province Science and Technology Development Planning (2012GSF11604)
National Natural Science Foundation of China (51075424)