A three-port switch NMR laser chaotic system with memristor and its circuit implementation Jieyang Wang, Jun Mou, Huizhen Yan, Xingce Liu, Yanjie Ma and Yinghong Cao Eur. Phys. J. Plus, 136 11 (2021) 1112 Published online: 06 November 2021 DOI: 10.1140/epjp/s13360-021-02097-1