  Based on a superposition method recently proposed to obtain 1-solitary wave
solutions of the KdV-Burgers equation \cite{Yua2005}, we show that this method
can also be used to find a 2-solitary wave solution of the Novikov-Veselov
equation. Thus, it seems that the method of Yuanxi and Jiashi in general is not
restricted to constructing 1-solitary wave solutions of nonlinear wave and
evolution equations (NLWEEs).
