Shi, Junping
Wang, Chuncheng
Wang, Hao
Yan, Xiangping
Funding for this research was provided by:
Division of Mathematical Sciences (1313243, 1715651)
Chinese NSF (11671110, 11201097)
NSERC (RGPIN-2015-04581)
Article History
Received: 19 December 2018
Revised: 10 April 2019
First Online: 6 May 2019