9Albert H Boudreau. Status of the U.S. Air Force HYTECH program. 12th AIAA International Space Planes and Hypersonic Systems and Technologies, 15 - 19 December 2003
10Laurent SERRE, Francois FALEMPIN. PROMETHEE : the French military hypersonic propulsion program status in 2002. 12th AIAA International Space Planes and Hypersonic Systems and Technologies 15 - 19 December 2003