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Ruan Z, Tang M, Liu Z.Ruan Z, et al.Phys Rev E Stat Nonlin Soft Matter Phys. 2012 Sep;86(3 Pt 2):036117. doi: 10.1103/PhysRevE.86.036117. Epub 2012 Sep 27.Phys Rev E Stat Nonlin Soft Matter Phys. 2012.PMID: 23030990