R. R. Muhammed and A. S. Mahdi, “Estimation of The Zenith Path Delay using RTK-DGPS measurements”, Iraqi Journal of Science, vol. 59, no. 2A, pp. 802–807, Apr. 2018, Accessed: Jun. 21, 2026. [Online]. Available: https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/302