1. Faculty of Management and EconomicsKunming University of Science and Technology Kunming China
2. State Key Laboratory of Complex Nonferrous Metal Resources Clean UtilizationKunming University of Science and Technology Kunming China
3. Faculty of Mechanical and Electrical EngineeringYunnan Agriculture University Kunming China
4. School of MathematicsThe University of Manchester Manchester UK
5. Faculty of Metallurgical and Energy EngineeringKunming University of Science and Technology Kunming China