Luyen, B. K. “REFINING GEOIDAL HEIGHTS COMPUTED BY FULLY-NORMALISED SPHERICAL HARMONICS COEFFICIENTS OF THE EARTH GRAVITATIONAL MODEL EGM2008 BY ADJUSTMENT OF COMBINED GPS/LEVELLING/GEOID NETWORK”. Vietnam Journal of Earth Sciences, vol. 36, no. 2, Aug. 2014, pp. 169-74, doi:10.15625/0866-7187/36/2/4498.