1. Center for Information Technologies and Applied Mathematics, University of Nova Gorica, Slovenia
2. Department of Mathematics, Tarbiat Modares University, Tehran, Iran
3. Department of Mathematics, Shahid Beheshti University, Tehran 1983963113, Iran
4. Department of Mathematics, Graduate University of Advanced Technology, Kerman, Iran
5. Department of Mathematics Education, Gyeongsang National University, Jinju 52828, Korea