1. Division of Applied Mathematics, Wonkwang University, 460 Iksan-daero, Iksan-Si, Jeonbuk 54538, Republic of Korea
2. Department of Mathematics, GITAM (Deemed to be University), Hyderabad Campus, Telangana 502329, India
3. Department of Mathematics Education, Gyeongsang National University, Jinju 52828, Republic of Korea