Franco, Luis, and Melvin Hoyer. “Geoidal Correction Methods for GPS Geodetics Measurements (Geoidal Correction)”. Rev. Téc. Fac. Ing. Univ. Zulia 18, no. 2 (January 27, 2011). Accessed November 13, 2025. http://www.produccioncientifica.luz.edu.ve/index.php/tecnica/article/view/5472.