@article{القحطاني_2020, 
  title={Fundamentals of Geo-Positioning Reference Frames, Map Projections and Their Applications}, 
  volume={17}, 
  DOI={10.21608/mkgc.2021.58753.1006}, 
  number={30}, 
  publisher={Egypts Presidential Specialized Council for Education and Scientific Research}, 
  author={القحطاني, ايمان}, 
  year={2020}, 
  month={Dec}
  }