M. Soleh, G. Jati, and M. H. Hilman, “MULTI OBJECT DETECTION AND TRACKING USING OPTICAL FLOW DENSITY – HUNGARIAN KALMAN FILTER (OFD - HKF) ALGORITHM FOR VEHICLE COUNTING”, Jurnal Ilmu Komputer dan Informasi, vol. 11, no. 1, pp. 17-26, Feb. 2018.