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References
- ↑ Les Ailes, No. 1,642, 20 July 1957. (French)
- ↑ "Hamburger Flugzeugbau", Flight, 19 October 1961, pp.619-20
- ↑ "Vergessenes Projekt der 50er Jahre - Der Turboprop-Airliner HFB-209", Klassiker der Luftfahrt, 14 January 2014. (German)
- ↑ "Civil Aviation: A New West German Turboprop", Flight 19 July 1957, p.93