Nonlinear dynamical analysis of a fractional-order El Niño Southern Oscillation systemAngana Das Mahapatra, Ankur Jyoti Kashyap, Gautam Choudhury, Santu Das and Hemanta Kumar SarmahEur. Phys. J. Plus, 140 7 (2025) 704DOI: https://doi.org/10.1140/epjp/s13360-025-06617-1