“Handing over the Results of Observations 11 Absolute Gravimetric Points on All Territory of Vietnam Between Vietnam Institute of Geodesy and Cartography and Moscow Geodesic Photogrammetrical Enterprise in 20/3/2009”. Journal of Geodesy and Cartography, no. 1 (September 25, 2009): 4. Accessed November 16, 2026. https://jgac.vn/index.php/journal/article/view/631.