“…Next, nonlinear dynamics researchers have proposed several sophisticated extensions to the classical predictive SIR model, including analytic techniques to find explicit solutions [18] , [19] , modifications to the SIR model with additional variables [20] , [21] , [22] , [23] , [24] , incorporation of Hamiltonian dynamics [25] or network models [26] and a closer analysis of uncertainty in the SIR approach [27] . Other mathematical approaches to prediction and analysis include power-law models [28] , [29] , [30] , distance analysis [31] , [32] , network models [33] , [34] , [35] , [36] , analyses of the dynamics of transmission and contact [37] , [38] , forecasting models [39] , Bayesian methods [40] , clustering [41] , [42] and many others [43] , [44] , [45] , [46] .…”