Abdul Halim, S., M. H. Othman, A. G. Buja, N. N. Abdul Rahid, A. A. Sharip, and S. M. Md Zain. “C19-SmartQ: Applying Real-Time Multi-Organization Queuing Management System Using Predictive Model to Maintain Social Distancing”. International Journal of Interactive Mobile Technologies (iJIM), vol. 15, no. 06, Mar. 2021, pp. pp. 108-123, doi:10.3991/ijim.v15i06.20597.