Double memristors series hyperchaotic system with attractive coexistence and its circuit implementationJieyang Wang, Yinghong Cao, Jun Mou and Xingce LiuEur. Phys. J. Spec. Top., 230 21-22 (2021) 3901-3912DOI: https://doi.org/10.1140/epjs/s11734-021-00330-7