Institution: | 1. Faculty of Economics and Commerces, Hoa Sen University, 08 Nguyen Van Trang Street, Dist. 1, HoChiMinh City, Viet Nam;2. Nhatrang Educational College, 01 Nguyen Chanh Street, Nhatrang City, Viet Nam;3. MAPMO, UMR 6628, bât. Mathématiques, University of Orléans, BP 6759, 45067 Orléeans Cedex 2, France;4. Department of Mathematics and Computer Science, University of Natural Science, Vietnam National University HoChiMinh City, 227 Nguyen Van Cu Street, Dist. 5, HoChiMinh City, Viet Nam |