[Lin, Qun] Chinese Acad Sci, Inst Computat Math, Beijing 100190, Peoples R China.
[Wang, Kaixin] Shandong Univ, Sch Math & Syst Sci, Jinan 250100, Shandong, Peoples R China.
[Wang, Hong] Univ S Carolina, Dept Math, Columbia, SC 29208 USA.
[Yin, Xiabo] Cent China Normal Univ, Dept Math, Wuhan 430079, Peoples R China.
[Lin, Qun] Chinese Acad Sci, Inst Computat Math, POB 2719, Beijing 100190, Peoples R China.