Diffusive Transport through a Nontwist Barrier in tokamaks. - Jefferson S. E. Portela; Iberê L. Caldas; Ricardo Luiz Viana; Philip J. Morrison (Int. J. Bifurc. Chaos, 2007)

Fractal and Wada Exit Basin Boundaries in tokamaks. - Jefferson S. E. Portela; Iberê L. Caldas; Ricardo Luiz Viana; Miguel A. F. Sanjuán (Int. J. Bifurc. Chaos, 2007)

Coexistence of Subharmonic Resonant Modes Obeying a Period-Adding Rule. - Tiago Kroetz; Jefferson S. E. Portela; Ricardo Luiz Viana (Int. J. Bifurc. Chaos, 2018)