Characteristics of optical multi-peak solitons induced by higher-order effects in an erbium-doped fiber systemYang Ren, Zhan-Ying Yang, Chong Liu, Wen-Hao Xu and Wen-Li YangEur. Phys. J. D, 70 9 (2016) 187DOI: https://doi.org/10.1140/epjd/e2016-70079-7