Lopes, António M., and J.A. Tenreiro Machado. “Analysis of Terrorism Data-Series by Means of Power Law and Pseudo Phase Plane”. Discontinuity, Nonlinearity, and Complexity, vol. 4, no. 4, Aug. 2026, pp. 403-11, https://doi.org/10.5890/DNC.2015.11.004.