He, Xiaolong http://orcid.org/0000-0002-3165-2883
de la Llave, Rafael
Funding for this research was provided by:
China Scholarship Council (201406130018)
Directorate for Mathematical and Physical Sciences (DMS-1500943)
National Natural Science Foundation of China (11271115)
Article History
Received: 9 November 2015
Revised: 3 February 2016
First Online: 19 February 2016