Cai, Li-Ming
Li, Xue-Zhi
Fang, Bin
Ruan, Shigui
Funding for this research was provided by:
National Natural Science Foundation of China (11271314)
National Natural Science Foundation of China (11371305)
National Science Foundation (DMS-1412454)
Article History
Received: 14 August 2015
Revised: 2 May 2016
First Online: 22 September 2016