1. https://dronebelow.com/2018/12/06/drone-classification-applications-and-challenges/
2. https://www.aviationtoday.com/2014/11/20/5-potential-commercial-uses-of-unmanned-aircraft-systems/
3. https://www.washingtontimes.com/news/2015/jun/16/russian-microwave-gun-can-disable-warheads-6-miles/
4. https://www.defenceweb.co.za/industry/industry-industry/desert-wolf-marketing-black-hornet-2-handheld-uav-in-sa/
5. https://www.hindustantimes.com/india-news/drdo-s-rustom-2-drone-flight-tested-india-goes-for-armed-heron-uavs/story-CZ5jd9tRo6Ph2jcq2HOpmM.html