Affiliation: | 1.Department of Surface Mining, Mining Faculty, Hanoi University of Mining and Geology, 18 Vien Str., Duc Thang Ward, Bac Tu Liem Dist., Hanoi, 100000, Vietnam ;2.Innovations for Sustainable and Responsible Mining (ISRM) Group, Hanoi University of Mining and Geology, 18 Vien Str., Duc Thang Ward, Bac Tu Liem Dist., Hanoi, 100000, Vietnam ;3.Mathematics Department, Faculty of Sciences, Hanoi University of Mining and Geology, 18 Vien Str., Duc Thang Ward, Bac Tu Liem Dist., Hanoi, 100000, Vietnam ; |