[Jicai Huang; Min Lu] School of Mathematics and Statistics, Hubei Key Lab–Math. Sci., Central China Normal University, Wuhan, Hubei 430079, PR China
[Chuang Xiang] School of Mathematical Sciences and Key Laboratory of NSLSCS (Ministry of Education), Nanjing Normal University, Nanjing 210023, PR China
[Lan Zou] School of Mathematical Sciences, Capital Normal University, Beijing 100089, PR China
通讯机构：
[Chuang Xiang] S
School of Mathematical Sciences and Key Laboratory of NSLSCS (Ministry of Education), Nanjing Normal University, Nanjing 210023, PR China
