Tien, Hung Nguyen -, et al. “Investigation of Microtremor Motion Variation by Nakamura’S H V Spectral Ratio Method”. <i>Vietnam Journal of Marine Science and Technology</i>, vol. 17, no. 4B, Dec. 2017, pp. 68-74, doi:10.15625/1859-3097/17/4B/12994.