Institution: | 1.Faculty of Mathematics and Computer Science, TU Bergakademie Freiberg, Freiberg, Germany ;2.Department of Mathematics, International University, Vietnam National University-Ho Chi Minh City, Ho Chi Minh City, Vietnam ;3.Department of Economic Sciences, Indian Institute of Technology, Kanpur, India ;4.Department of Mathematics and Statistics, Indian Institute of Technology, Kanpur, India ; |