1. Department of Mathematics, Faculty of Science, Cairo University, Giza, Egypt
M. Elsaid Ramadan
2. Department of Mathematics, Faculty of Science, Islamic University of Madinah, Medina, Saudi Arabia
Hijaz Ahmad
3. Near East University, Operational Research Center in Healthcare, Near East Boulevard, PC: 99138 Nicosia/Mersin 10, Turkey 4. Section of Mathematics, International Telematic University Uninettuno, Corso Vittorio Emanuele II, 39, 00186 Roma, Italy
Thongchai Botmart
5. Department of Mathematics, Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand