Won-Hyuk Choi, Hye-Gi Park, Je-Hong Park. “Identification Of Hazards Based On Pbs (Product Based Structure) For Each Operation Scenario Of Small Uavs”. Design Engineering (September 17, 2021): 8374-8393. Accessed April 29, 2024. http://www.thedesignengineering.com/index.php/DE/article/view/4459.