M-derivative applied to the dispersive optical solitons for the Schrödinger-Hirota equation H. Yépez-Martínez and J. F. Gómez-Aguilar Eur. Phys. J. Plus, 134 3 (2019) 93 Published online: 11 March 2019 DOI: 10.1140/epjp/i2019-12459-7