1. Department of Mathematics, COMSATS University Islamabad, Attock Campus, Attock, Pakistan
2. Department of Business Administration, Gyeongsang National University, Jinju 52828, Republic of Korea
3. Department of Refrigeration and Air Conditioning Engineering, Chonnam National University, Yeosu 59626, Republic of Korea
4. School of Mathematics and Statistics, Northeast Normal University, Changchun 130000, China