“…Other exact solutions also have been investigated by many researchers, and some of powerful methods have been presented, such as the extended Jacobi elliptic function expansion method [10][11][12][13], inverse scattering transformation method [14,15], multiple exp-function method [16,17], extended F-expansion method [18], the Hirota method [19][20][21][22][23][24][25], G G -expansion method [26,27], the Weierstrass elliptic function method [28][29][30] and so on. Nakamura [31,32] proposed a convenient way to construct a kind of quasi-periodic solutions of nonlinear equations in his two serial papers.…”