Mohapatra, B. N., R. K. Mohapatra, M. Mirpagar, and A. Quershi. “Ultrasonic Based Easy Parking System Based on Microcontroller”. International Journal of Innovative Technology and Interdisciplinary Sciences, Vol. 3, no. 2, Apr. 2020, pp. 429-34, doi:10.15157/IJITIS.2020.3.2.429-434.