1. H.Glauert, The Elements of Aerofoil and Airscrew Theory. Cambridge: Cambridge University Press (1926) p. 87.
2. G.K.Batchelor, An Introduction to Fluid Mechanics, Cambridge: Cambridge University Press (1967) p. 467.
3. L.M.Milne-Thomson, Theoretical Aerodynamics, 2nd edn. London: MacMillan & Co. (1952) p. 138.
4. B.Thwaites (ed.), Incompressible Aerodynamics. Oxford: Clarendon Press (1960) p. 123.
5. N.E.Kochin, I.A.Kibel' and N.V.Roze, Theoretical Hydrodynamics, New York: Interscience Publishers (1964).