Insightful inspection of the nonlinear instability of an azimuthal disturbance separating two rotating magnetic liquid columnsGalal M. Moatimid, Mona A. A. Mohamed and Khaled ElagamyEur. Phys. J. Plus, 139 7 (2024) 590DOI: https://doi.org/10.1140/epjp/s13360-024-05371-0