Series solutions of nonlinear conformable fractional KdV-Burgers equation with some applications Ahmad El-Ajou, Zeyad Al-Zhour, Moa’ath Oqielat, Shaher Momani and Tasawar Hayat Eur. Phys. J. Plus, 134 8 (2019) 402 Published online: 27 August 2019 DOI: 10.1140/epjp/i2019-12731-x