Day, Richard E. (1997). Coupling Dynamics in Aircraft: A Historical Perspective(PDF) (Technical report). Edwards, California: NASA Office of Management Scientific and Technological Information Program. p. 2. Special publication 532. Archived from the original(PDF) on 5 Feb 2005. Retrieved December 10, 2020.
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Day, Richard E. (1997). Coupling Dynamics in Aircraft: A Historical Perspective(PDF) (Technical report). Edwards, California: NASA Office of Management Scientific and Technological Information Program. p. 2. Special publication 532. Archived from the original(PDF) on 5 Feb 2005. Retrieved December 10, 2020.