1. Van Dyke, M. 1975 Perturbation Methods in Fluid Mechanics. Parabolic Press.
2. Eames, I. , Belcher, S. E. & Hunt, J. C. R. 1994 Drift, partial drift and Darwin's proposition.J. Fluid Mech. 275,201–223.
3. Batchelor, G. K. 1945 Power series expansion of the velocity potential in compressible flow.Q. Appl. Maths 2,318–328.
4. Lighthill, J. M. 1954 Higher approximations. In General Theory of High Speed Aerodynamics (ed. W. R. Sears ). Princeton University Press.
5. Yih, C.-S. 1985 New derivations of Darwin's theorem.J. Fluid Mech. 152,163–172.