Abbas Neam Al dami, Haidar, and Isaraa Riyadh Abdulridha. “The Possibility of Using Navigation GPS Devices in the Survey Engineering”. International Journal of Engineering and Technology, vol. 7, no. 4.20, Nov. 2018, pp. 293-8, https://doi.org/10.14419/ijet.v7i4.20.25942.