1. Mark J. Ablowitz, Nonlinear dispersive waves, Cambridge Texts in Applied Mathematics, Cambridge University Press, New York, 2011, Asymptotic analysis and solitons. MR 2848561
2. Mark J. Ablowitz, David J. Kaup, Alan C. Newell, and Harvey Segur, The inverse scattering transform-Fourier analysis for nonlinear problems, Studies in Appl. Math. 53 (1974), no. 4, 249–315. MR 0450815
3. Mark J. Ablowitz and Harvey Segur, Solitons and the inverse scattering transform, SIAM Studies in Applied Mathematics, vol. 4, Society for Industrial and Applied Mathematics (SIAM), Philadelphia, Pa., 1981. MR 642018
4. Kari Astala, Daniel Faraco, and Keith M. Rogers, On Plancherel’s identity for a two-dimensional scattering transform, Nonlinearity 28 (2015), no. 8, 2721–2729. MR 3382582
5. Kari Astala, Tadeusz Iwaniec, and Gaven Martin, Elliptic partial differential equations and quasiconformal mappings in the plane, Princeton Mathematical Series, vol. 48, Princeton University Press, Princeton, NJ, 2009. MR 2472875