Asymptotic Calculation of Discrete Nonlinear Wave Interactions
  We illustrate how to compute asymptotic interactions between discrete solitary waves of dispersive equations, using the approach proposed by Manton [Nucl. Phys. B 150, 397 (1979)]. We also discuss the complications arising due to discreteness and showcase the application of the method in nonlinear Schrodinger, as well as in Klein-Gordon lattices, finding excellent agreement with direct numerical computations. 
P.G. Kevrekidis, Avinash Khare, A. Saxena, I. Bena and A.R. Bishop