YOUSEF, MOHANAD MOHSEN, and MOHAMMED ANWER JASIM. 2020. “GNSS OBSERVATIONS TO FIND THE RELATIONSHIP BETWEEN THE GLOBAL DATUM WORLD GEODETIC SYSTEM WGS84 AND THE LOCAL DATUM KARBALA 1979. A CASE STUDY OF ERBIL-DUHOK TERRITORY ”. Journal of Duhok University 22 (2), 102-8. https://doi.org/10.26682/sjuod.2019.22.2.11.