1. Air Accidents Investigation Branch (AAIB), 2020. Bulletin 5/2020.
2. Semi-supervised learning;Chapelle,2006
3. DroneRules.eu, 2018. Privacy Code of Conduct. https://dronerules.eu/assets/files/PCC_DR_final-for-printing_9-November-2018.pdf
4. Selective attention and the organization of visual information;Duncan;Journal of Experimental Psychology,1984