1. A Drone, Too Small for Radar to Detect, Rattles the White House
https://www.nytimes.com/2015/01/27/us/white-house-drone.html
2. A Closer Look at the Drone Attack on Maduro in Venezuela
https://www.nytimes.com/2018/08/10/world/americas/venezuela-video-analysis.html
3. A Monocular Vision-Based Target Surveillance and Interception System Demonstrated in a Counter Unmanned Aerial System (CUAS) Application, Purdue University
https://search.proquest.com/openview/b64db12daef7934e29dfc013c2d61973/1?pq-origsite=gscholar&cbl=18750&diss=y
4. Daredevil: Ultra-wideband radar sensing for small UGVs;Yamauchi;Unmanned Syst. Tech. IX Int. Soc. Opt. Photonics,2007