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Error tolerance and attack vulnerability are two common and important properties of complex networks, which are usually used to evaluate the robustness of a network. Recently, much work has been devoted to determining the network design with optimal robustness. However, little attention has been paid to the problem of how to improve the robustness of existing networks. In this paper, the authors present a new parameter ?, called enforcing parameter, to guide the process of enhancing the robustness of scale-free networks by gradually adding new links.
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