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3. H Blasius, Umber Schwingungsercheiningen an Einholmigen Unterflugeln. (Z. Flugtech.u.Motorluftschif. 16, 1925), pp. 39–42
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5. H. Glauret, The Force and Moment of an Oscillating Aerofoil. (Aeronautical Research Committee, R & M. 1929) 1242