Julge, Kalev, Artu Ellmann, and Romet Köök. “Unmanned Aerial Vehicle Surveying For Monitoring Road Construction Earthworks”. The Baltic Journal of Road and Bridge Engineering 14, no. 1 (March 28, 2019): 1–17. Accessed May 3, 2024. https://bjrbe-journals.rtu.lv/bjrbe/article/view/bjrbe.2019-14.430.