J. S. E. PORTELA, Caldas, I. L., and Viana, R. L., “Tokamak magnetic field lines described by simple maps”, The European Physical Journal Special Topics, vol. 165, no. 1, pp. 195 - 210, 2008.

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I. L. Caldas, Viana, R. L., Szezech, J. D., PORTELA, J. S. E., da Fonseca, J. D., Roberto, M., Martins, C. G. L., and da Silva, E. J., “Nontwist symplectic maps in tokamaks”, Communications in Nonlinear Science and Numerical Simulation, vol. 17, no. 5, pp. 2021 - 2030, 2012.

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J. S. E. PORTELA, Caldas, I. L., Viana, R. L., and Sanjuan, M. A. F., “FRACTAL AND WADA EXIT BASIN BOUNDARIES IN TOKAMAKS”, International Journal of Bifurcation and Chaos, vol. 17, no. 11, pp. 4067 - 4079, 2007.

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E. C. da Silva, Roberto, M., PORTELA, J. S. E., Caldas, I. L., and Viana, R. L., “Escaping and transport barrier due to ergodic magnetic limiters in tokamaks with reversed magnetic shear”, Nuclear Fusion, vol. 46, no. 4, pp. S192 - S198, 2006.

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J. S. E. PORTELA, Caldas, I. L., Viana, R. L., and Morrison, P. J., “DIFFUSIVE TRANSPORT THROUGH A NONTWIST BARRIER IN TOKAMAKS”, International Journal of Bifurcation and Chaos, vol. 17, no. 05, pp. 1589 - 1598, 2007.

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J. S. E. PORTELA, Viana, R. L., and Caldas, I. L., “Chaotic magnetic field lines in a Tokamak with resonant helical windings”, Chaos, Solitons & Fractals, vol. 11, no. 5, pp. 765 - 778, 2003.

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