About the Authors
MIAO CHUNMEI
aSCHOOL OF MATHEMATICS AND STATISTICS, NORTHEAST NORMAL UNIVESITY, 5268 RENMIN STREET, CHANGCHUN, JILIN, 130024, P.R. CHINA.Email address:mathchunmei2012@aliyun.com
GE WEIGAO
bSCHOOL OF MATHEMATICS, BEIJING INSTITUTE OF TECHNOLOGY, BEIJING 100081, P.R. CHINA.Email address:gew@bit.edu.cn
ZHANG ZHAOJUN
cSCHOOL OF SCIENCE, CHANGCHUN UNIVERSITY, CHANGCHUN, JILIN, 130022, P.R. CHINA.Email address:1448494218@qq.com