Item from Mathematical Reviews (American Mathematical Society)--access their stable url through the AMS database via an institutional library:

MR2184706 (2006g:91131) Kempe, David; Kleinberg, Jon; Tardos, Éva Influential nodes in a diffusion model for social networks. Automata, languages and programming, 1127--1138, Lecture Notes in Comput. Sci., 3580, Springer, Berlin, 2005. (Reviewer: Sandra L. Arlinghaus) 91D30 (05C90)