N. T. Nghia
Sergo Ordzhonikidze Russian State University for Geological Prospecting; Viet Nam Institute of Strategy and Policy for Industry and Trade
Russian Federation

Nguyen Trong Nghia — postgraduate student of the Department of Ecology and Nature Management

23, Miklukho-Maklay str., Moscow 117997

17 Yet Kieu str., Hanoi 10000

tel.: +7 (925) 034-28-60

V. N. Ekzaryan
Sergo Ordzhonikidze Russian State University for Geological Prospecting
Russian Federation

Vladimir N. Ekzaryan — Dr. Sci. (Geol.-Mineral.), Professor, Honored Ecologist of Russia, Head of the Department of Ecology and Nature Management

23, Miklukho-Maklay str., Moscow 117997

tel.: +7 (967) 241-53-48

D. V. Binh
Hanoi University of Mining and Geology
Viet Nam

Duong Van Binh — Cand. Sci. (Geol.-Mineral.), Lecturer,
Department of Engineering Geology, Faculty of Geosciences and Geoengineering

18, Vien str., Hanoi 10000

tel.: (+84) 904546259