Theoretical and numerical investigations on solitary wave solutions of Gardner equation Turgut Ak, Houria Triki, Sharanjeet Dhawan and Kutsi S. Erduran Eur. Phys. J. Plus, 133 9 (2018) 382 Published online: 24 September 2018 DOI: 10.1140/epjp/i2018-12199-2