Many of those studies are in the domain of complex networks [1-7], especially in the first decade of this century, after two milestones: the small-world network [8] and the scale-free network [9].
许多这些研究都是在复杂网络[1 - 7]的领域,尤其是在本世纪的第一个十年里,在两个里程碑之后:小世界网络[8]和无标度网络[9]。