M. Mustaffa, S. Ahmad2, R. Mohd Nor, and N. Hidayah Binti Zahari, “Preliminary Study on Air Traffic Density of Peninsular Malaysia using Visual Flight Path Trajectories from Automatic Dependent Surveillance-Broadcast (ADS-B) Data”, IJET, vol. 7, no. 4.25, pp. 1–4, Nov. 2018, doi: 10.14419/ijet.v7i4.25.22238.