KSC booklet, Quote: "Since the first Space Shuttle launch on April 12, 1981, 42 different SSMEs have successfully demonstrated the performance, safety, and reliability of the world's only reusable liquid-fuel rocket engine.", source
engineeringatboeing.com
“Nozzle Design”. Threshold - Pratt & Whitney Rocketdyne's engineering journal of power technology (1992年). 2010年11月7日閲覧。[リンク切れ]