1. Faculty of Economics and Business, Universiti Malaysia Sarawak Kota Samarahan, 94300, Sarawak, MALAYSIA
2. College of Finance and Mathematics, West Anhui University Yueliang Dao, West of Yunlu Bridge, Lu An, An Hui, CHINA
3. College of Mathematics and Statistics, Fuzhou University No. 2, wulongjiang Avenue, Minhou County, Fuzhou, CHINA