Ahmad Fathan Fadzulli, et al. “TiungLap: A Quadcopter Drone for Window Cleaning With an Integrated Pressure Washer Tethering System”. International Journal of Integrated Engineering, vol. 17, no. 8, Dec. 2025, pp. 169-80, https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/24088.