M. N. Alam, M. A. Akbar, M. Hafez, and F. B. M. Belgacem, “APPLICATION OF NEW GENERALIZED (G′/G)-EXPANSION METHOD TO THE (3 + 1)-DIMENSIONAL KADOMTSEV-PETVIASHVILI EQUATION”, IJPAM, vol. 36, pp. 415–428, Jul. 2016.