1. Accident Investigation Branch, Department of Transport, RAF Farnborough, UK.
2. Linacre College, Oxford, UK.
3. and FAA-AM-67-4-1967.
4. NPRM69-2, Protective Smoke Hoods for Emergency Use by Passengers and Crew Members, US Federal Register, 1969.
5. AAM-119-87-2, CAMI, USA, 1987.