Characteristics of higher-order vector rogue waves to a coupled fourth-order nonlinear Schrödinger system in a two-mode optical fiberZhong Du, Bo Tian, Qi-Xing Qu and Xue-Hui ZhaoEur. Phys. J. Plus, 135 2 (2020) 241DOI: https://doi.org/10.1140/epjp/s13360-020-00240-y