D. H. Cuong, B. T. B. Anh, N. T. Nhan, N. X. Tung, P. D. Hung, and N. X. Thanh, “VIETNAM - RUSSIAN COOPERATION INSTALLING AND TESTING THE TOMOGRAPHY ELECTRIC COMPLEX (TEC-2) FOR INVESTIGATION OF SHALLOW GEOLOGICAL ENVIRONMENT”, VJMST, vol. 15, no. 4, pp. 399–405, Dec. 2015.