Akhmediev, NailAnkiewicz, AdrianSoto-Crespo, J.M.Dudley, John M2015-12-070375-9601http://hdl.handle.net/1885/25943We analyse triangular spectra that appear in many branches of physics that deal with parametrically-driven systems, and give a simple theoretical analysis for them in terms of the nonlinear dynamics of multimode fields. Such spectra appear universally asCopyright Information: © 2010 Elsevier B.V.201110.1016/j.physleta.2010.11.0442016-02-24