Kadomtsev-Petviashvili equation: Nonlinear self-adjointness and   conservation laws
  The method of nonlinear self-adjointness is applied to the Kadomtsev-Petviashvili equation. The infinite set of conservation laws associated with the infinite algebra of Lie point symmetry of the KP equation is constructed. 
Nail H. Ibragimov
math-ph math.MP