貌似用google搜到了，可是却不能下。
Complex Contagions and the Weakness of Long Ties
Centola, Damon & Macy, Michael
American Journal of Sociology; Nov2007, Vol. 113 Issue 3, p702, 33p, 2 Diagrams, 3 Graphs
http://www.journals.uchicago.edu/doi/abs/10.1086/521848?prevSearch=%2528Complex%2BContagions%2Band%2Bthe%2BWeakness%2Bof%2BLong%2BTies%2529%2BAND%2B%255Bjournal%253A%2Bajs%255D&searchHistoryKey=
或
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.133.9694&rep=rep1&type=pdf
research interest: small world network
email:lanfeng.pan /at/ cos.name
