Strange nonchaotic attractor in memristor-based van der Pol oscillatorD. Premraj, Suresh Kumarasamy, K. Thamilmaran and Karthikeyan RajagopalEur. Phys. J. Spec. Top., 231 16-17 (2022) 3143-3149DOI: https://doi.org/10.1140/epjs/s11734-022-00562-1