Yin-Long Zhao Yin-Ping Liu Zhi-Bin Li A modified WTC algorithm for the Painlevé test of nonlinear variable-coefficient PDEs. 2123-2128 2009 180 Computer Physics Communications 11 http://dx.doi.org/10.1016/j.cpc.2009.06.013 db/journals/cphysics/cphysics180.html#ZhaoLL09