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. 2017 Feb 13;7:42431. doi: 10.1038/srep42431

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Nodes are ordered according to fitness. (a) A₀ (homogeneous case) - results (b) A₀ - Two examples of convergence (c) A₁ (tiered case) - results (d) A₁ - Two examples of convergence. It can be seen that in both homogeneous and tiered cases, the iterative algorithms eventually converge to solutions that exactly match those calculated by proportional attachment based on node fitness.