Digital Revolution for Hajj Crowd Management: A Technology Survey. - Emad A. Felemban; Faizan Ur Rehman; Sardar Asad Ali Biabani; Akhlaq Ahmad; Atif Naseer; Abdur Rahman Muhammad Abdul Majid; Omar K. Hussain; Ahmad Muaz Qamar; Rowid Falemban; Fakhri Zanjir (IEEE Access, 2020)