On the steadiness and instability of the Intermediate Western Boundary Current between 24°S and 18°S - Napolitano, Dante Campagnoli; Silveira, Ilson Carlos Almeida da; Rocha, César Barbedo; Flierl, Glenn Richard; Calil, Paulo H. R.; Martins, Renato P. (Journal of Physical Oceanography, 2019)