1. Stakgold, I. 1979 Green's Functions and Boundary Value Problems .Wiley.
2. Huerre, P. 1980 The nonlinear stability of a free shear layer in the viscous critical layer regime.Phil. Trans. R. Soc. Lond. A 293,643–675.
3. Drazin, P. G. & Howard, L. N. 1966 Hydrodynamic stability of parallel flow of inviscid fluid.Adv. Appl. Mech. 9,1–89.
4. Brown, S. N. & Stewartson, K. 1980 On the nonlinear reflexion of a gravity wave at a critical level. Part 1.J. Fluid Mech. 100,577–595.
5. Weissman, M. A. 1979 Nonlinear wave packets in the Kelvin—Helmholtz instability.Phil. Trans. R. Soc. Lond. A 290,639–681.