Du, Shaohong
Lin, Runchang
Zhang, Zhimin
Funding for this research was provided by:
The National Natural Science Foundation of China (91430216, 11471031, and 11428103)
The US National Science Foundation (DMS-1419040 and DMS-1217268)
Article History
Received: 15 January 2015
Accepted: 18 December 2015
First Online: 12 January 2016