“…Up to now, many powerful methods for this subject have been built: the improved F-expansion method [8], the G′/G-expansion method [9], the improved G′/G 2 -expansion method [10], the improved (m + G′/G)-expansion method [11], the (G′/G, 1/G)-expansion method [12], the improved extended Tanh technique [13], the subequation technique [14], the Sine-Gordon expansion method [15], the EXP (−φðξÞ) technique [16], the Bäcklund transformation method [17], the Darboux transformation method [18], the Hirota bilinear method [19], the first integral method [20], the Jacobi elliptic function expansion method [21], the Lie symmetry method [22], the new Kudryashov method [23], etc. [24][25][26][27][28][29][30].…”