Hamdy Gomaa Abdel Aziz, Wael Hassan Nabil Mohamed. Sustaining the Quality of Telecommunication Services by Using Geographic Information Systems (GIS) (A Field Study on Telecom Egypt-WE). DE [Internet]. 2021May15 [cited 2024May3];:519-46. Available from: http://thedesignengineering.com/index.php/DE/article/view/1563