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### Co-authors

- Suthep SuantaiDepartment of Mathematics, Chiang Mai UniversityVerified email at cmu.ac.th
- Nimit NimanaDepartment of Mathematics, Faculty of Science, Khon Kaen UniversityVerified email at kku.ac.th
- Yeol-Je ChoProfessor and Ph. D., Department of Mathematics Education, Gyeongsang National UniversityVerified email at gnu.ac.kr
- Poom KumamDepartment of Mathematics, Faculty of Science, King Mongkut's University of Technology ThonburiVerified email at mail.kmutt.ac.th
- Kriengsak WattanawitoonRajamangala University of Technology Lanna TakVerified email at rmutl.ac.th
- Daishi KuroiwaShimane UniversityVerified email at riko.shimane-u.ac.jp
- Montira SuwannaprapaRajamangala University of Technology LannaVerified email at rmutl.ac.th
- Lech MaligrandaProfessor of Mathematics, Luleå University of TechnologyVerified email at ltu.se
- Ioannis ArgyrosCameron UniversityVerified email at cameron.edu
- Jittiporn TangkhawiwetkulLecturer at Pibulsongkram Rajabhat UniversityVerified email at psru.ac.th