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 _______________________________ Do you Yahoo!? Win 1 of 4,000 free domain names from Yahoo! Enter now. http://promotions.yahoo.com/goldrush