Three broad phases in development may be distinguished: aircraft needs, aircraft design, and aircraft operation.
(1957), "S.A.E. Annual Meeting: Summaries of the Papers Presented to the Meeting Held in Detroit, January 14–18, 1957", Aircraft Engineering and Aerospace Technology, Vol. 29 No. 5, pp. 152-154. https://doi.org/10.1108/eb032828Download as .RIS
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