Duong, T.T., Dao, V.K., Truong, M.H. and Nguyen, D.M. 2017. Improving the accuracy of Digital Elevation Model by using Kalman filter and Rauch-Tung-Striebel smoother. Journal of Geodesy and Cartography. 31 (Mar. 2017), 29–34. DOI:https://doi.org/10.54491/jgac.2017.31.208.