Bicomplexes and Integrable Models
  We associate bicomplexes with several integrable models in such a way that conserved currents are obtained by a simple iterative construction. Gauge transformations and dressings are discussed in this framework and several examples are presented, including the nonlinear Schrodinger and sine-Gordon equations, and some discrete models. 
Aristophanes Dimakis and Folkert Muller-Hoissen