Applications of He's semi-inverse method, ITEM and GGM to the Davey-Stewartson equation Reza Farshbaf Zinati and Jalil Manafian Eur. Phys. J. Plus, 132 4 (2017) 155 Published online: 10 April 2017 DOI: 10.1140/epjp/i2017-11463-3