Chaos in a memristive oscillator with six lines of equilibria Janarthanan Ramadoss, Christos Volos, Viet-Thanh Pham, Karthikeyan Rajagopal and Iqtadar Hussain Eur. Phys. J. Spec. Top., 231 16-17 (2022) 3059-3065 Published online: 16 April 2022 DOI: 10.1140/epjs/s11734-022-00555-0