H. Seedahmed, Gamal. “On The Integration and Evaluation of Vertical Control Information and Uncertainties in Leveling Networks Using Least Squares Modeling”. University of Khartoum Engineering Journal 7, no. 2 (October 23, 2022). Accessed July 19, 2025. https://uofkej.uofk.edu/index.php/uofkej/article/view/177.