Zhou, Zhe
Wu, Chuan-Xi
Mao, Jing
Funding for this research was provided by:
NSF of China (11401131)
China Scholarship Council (-)
Fok Ying-Tung Education Foundation (-)
Hubei Key Laboratory of Applied Mathematics (-)
Article History
Received: 11 August 2018
Accepted: 18 February 2019
First Online: 28 February 2019
Competing interests
: The authors declare that they have no competing interests.