Strange nonchaotic attractor in memristor-based van der Pol oscillator D. Premraj, Suresh Kumarasamy, K. Thamilmaran and Karthikeyan Rajagopal Eur. Phys. J. Spec. Top., 231 16-17 (2022) 3143-3149 Published online: 21 April 2022 DOI: 10.1140/epjs/s11734-022-00562-1