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- [36] January rollout targeted for X-33 demonstrator AVIATION WEEK & SPACE TECHNOLOGY, 1999, 150 (23): : 57 - 57
- [39] NASA squeezing X-33 for engine technology Aviation Week and Space Technology (New York), 2001, 155 (05):
- [40] X-33 program risks unnecessarily high AVIATION WEEK & SPACE TECHNOLOGY, 1996, 144 (05): : 74 - 74