1.Truong xuan Luan Hanoi University of Mining and Geology Email: txluan@netnam.vn Fax : (84)-4-8385840 Office: 84-4-8387570 Tel: 84912141334.Home: 8447169226

2.Truong Xuan Quang Hanoi University of Mining and Geology Email: truongxuanquang@yahoo.com Mob: 84912114469

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