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- [36] Prediction of X-33 engine dynamic environments PROCEEDINGS OF THE 18TH AEROSPACE TESTING SEMINAR, 1999, : 257 - 263
- [37] Engineers anticipated X-33 tank failure AVIATION WEEK & SPACE TECHNOLOGY, 1999, 151 (20): : 28 - 30
- [38] January rollout targeted for X-33 demonstrator AVIATION WEEK & SPACE TECHNOLOGY, 1999, 150 (23): : 57 - 57