The crossover from strong to weak chaos for nonlinear waves in disordered systems T. V. Laptyeva, J. D. Bodyfelt, D. O. Krimer, Ch. Skokos and S. Flach EPL, 91 3 (2010) 30001 Published online: 16 August 2010 DOI: 10.1209/0295-5075/91/30001