Soliton equations in N-dimensions as exact reductions of the Self-Dual   Yang-Mills equation V. Simplest (2+1)-dimensional soliton equations
  Some aspects of the multidimensional soliton geometry are considered. It is shown that some simples (2+1)-dimensional equations are exact reductions of the Self-Dual Yang-Mills equation or its higher hierarchy. 
Kur.R.Myrzakul and R.Myrzakulov