Design of fractional-order hyper-chaotic multi-scroll systems based on hysteresis seriesLiping Chen, Wei Pan, J.A. Tenreiro Machado, António M. Lopes, Ranchao Wu and Yigang HeEPJ - Special Topics, 226 16-18 (2017) 3775-3789DOI: https://doi.org/10.1140/epjst/e2018-00012-8