Affiliation: | 1 Department of Statistics and Actuarial Science, The University of Hong Kong, Pokfulam Road, Hong Kong. kcyuen{at}hku.hk, 2 Academy of Mathematics and Systems Science, Chinese Academy of Sciences, Beijing, China. jshi{at}iss.ac.cn, 3 Department of Mathematics, Hong Kong Baptist University, Kowloon Tong, Hong Kong. lzhu{at}hkbu.edu.hk |