Chang, Der-Chen
Feng, Sheng-Ya
Funding for this research was provided by:
an NSF grant (DMS-1408839)
a McDevitt Endowment Fund at Georgetown University
the National Natural Science Foundation of China (Grant No. 11426109 and No. 11501203)
the Fundamental Research Funds for the Central Universities of China (Grant No. 22A201514035)