1. Center of Operations Research, Miguel Hernández University of Elche, Elche (Alicante), Spain
2. Department of Mathematics, International University Vietnam National University-Ho Chi Minh City, Ho Chi Minh City, Vietnam
3. Department of Mathematics and Computer Science, University of Science-VNUHCM, Ho Chi Minh City, Vietnam
4. Department of Natural Sciences, Tien Giang University, Tien Giang town, Vietnam