1. G.B. Whitham, Linear and Nonlinear Waves, Wiley, New York.
2. The hydrodynamical relevance of the Camassa–Holm and Degasperis–Procesi equations;Constantin;Arch. Ration. Mech. Anal.,2009
3. Asymptotic integrability;Degasperis,1999
4. Integral and Non-Integrable Equations with Peakons, Nonlinear Physics: Theory and Experiment, II (Gallipoli 2002);Degasperis,2002
5. Water waves and integrability;Ivanov;Phil. Trans. R. Soc. A,2007