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- Nonlinear soliton interaction with acoustic signals. Focusing effectsPublication . Rodríguez, O. C.; Jesus, S. M.; Stephan, Y.; Demoulin, X.; Porter, M. B.; Coelho, E.The problem of nonlinear interaction of solitary wave packets with acoustical signals has been intensively studied in recente years. A key goal is to explain the observed transmission loss of shallow-water propagating signals, which has been found to be strongly time-dependent, anisotropic, and sometimes exhibited unexpected attenuation vs. frequency.