Xm. Qian et Sy. Lou, FORMAL SERIES SYMMETRY APPROACH FOR A GENERALIZED TYPE OF HIGH-DIMENSIONAL MODELS, Communications in Theoretical Physics, 24(2), 1995, pp. 171-176
A formal series symmetry formula is given for a quite generalized part
ial differential-difference vector equation. The details about the sym
metries of the KP equation are restudied by means of the potential KP
equations.