“…Nevertheless, many methods have been developed to obtain exact solutions of the NLPDEs. These methods include the modified harmonic balance method [28], the BPVK method [31], Hirota's bilinear transformation method [21,9], the simplest equation method [16,17], the homotopy perturbation method [15], the tanh-function method [25], the Jacobi elliptic function expansion method [22], the inverse scattering method [1], the F-expansion method [38], the projective Riccati equation method [8], the tanh-coth method [33], Kudryashov's method [18,29], Lie symmetry methods [27,3,26,10,11,12,24,4,7], bifurcation method [37] and the (G /G)−expansion method [32].…”