Conservation Laws of Discrete Korteweg-de Vries Equation
  All three-point and five-point conservation laws for the discrete Korteweg-de Vries equations are found. These conservation laws satisfy a functional equation, which we solve by reducing it to a system of partial differential equations. Our method uses computer algebra intensively, because the determining functional equation is quite complicated. 
Olexandr G. Rasin and Peter E. Hydon