Vấn, N. T., V. M. Triết, Đặng H. Trung, L. V. A. Cường, and N. V. Giảng. “Estimating Electromagnetic Velocity in Ground Penetrating Radar by Normal MoveOut (NMO)”. Vietnam Journal of Earth Sciences, vol. 35, no. 2, Feb. 2014, pp. 137-45, doi:10.15625/0866-7187/35/2/3658.