Zephyr and the development of high-altitude military surveillance drones – Drone Wars UK

Empowering Technology: Drones

Zephyr – down but definitely not out

RAF drone fleet will double and will include the new Protector

Sensor, Shooter, Jammer – The Future of Intelligence, Surveillance, and Reconnaissance in the Urban Battlespace

Zephyr brochure

The Bureau of Investigative Journalism (en-GB)

West's military advantage is being eroded, report warns, Arms trade

Unmanned aerial vehicle, Military Wiki

UK military buys third £4m Zephyr drone for 'persistent surveillance' trials • The Register

What Is PHASA-35? Cutting Edge Stratosphere Drone Passes Key Test in U.S.

Future Threats: Military UAS, Terrorist Drones, and the Dangers of the Second Drone Age - Joint Air Power Competence Centre

Britain to get drones able to spy from stratosphere

Zephyr and the development of high-altitude military surveillance drones – Drone Wars UK

DARPA Archives - The UAV Digest

The slow and delicate aircraft taking on spy missions