Truong NN, Nhac TV. Determination of the constant <i>W</i>_o for local geoid of Vietnam and it’s systematic deviation from the global geoid. VJMST [Internet]. 2017 Dec. 15 [cited 2024 May 4];17(4B):138-44. Available from: https://vjs.ac.vn/index.php/jmst/article/view/13001