Yu, Xiaoling
Zhang, Xiong
Zhang, Haojing
Xiong, Dingrong
Chen, Yongyun
Huang, Xia
Funding for this research was provided by:
Science Foundation of Yunnan Province of China (2012F13140,2010CD046)
National Nature Science Foundation of China (11063004, 11163007,U1231203)
High-Energy Astrophysics Science and Technology Innovation Team of Yunnan Higher School and Yunnan Gravitation Theory Innovation Team (2011c1)