1. Division of Applied Mathematics, Thu Dau Mot University, Binh Duong Province, Vietnam
2. Department of Mathematics, Çankaya University, 06790 Ankara, Turkey
3. Department of Medical Research, China Medical University, Taichung, Taiwan
4. Institute of Research and Development of Processes University of the Basque Country, 48940 Leioa, Spain
5. Department of Mathematics and Computer Sciences, Transilvania University of Brasov, Brasov, Romania