Hidden and self-excited attractors in an extended Sprott C system with two symmetric or asymmetric equilibrium pointsTingting Yu, Wenzheng Ma, Zhuang Wang and Xianli LiEur. Phys. J. Spec. Top., 233 6 (2024) 1287-1299DOI: https://doi.org/10.1140/epjs/s11734-023-00950-1