System identification based on sparse approximation of Koopman operator Tiantian Lu, Jinqian Feng, Jin Su, Youpan Han and Qin Guo Eur. Phys. J. Spec. Top., 234 3 (2025) 571-584 Published online: 31 July 2024 DOI: 10.1140/epjs/s11734-024-01264-6