Atip Asvanund Karen Clay Ramayya Krishnan Michael D. Smith An Empirical Analysis of Network Externalities in Peer-to-Peer Music-Sharing Networks. 155-174 2004 15 Information Systems Research 2 http://dx.doi.org/10.1287/isre.15.2.155 db/journals/isr/isr15.html#AsvanundCKS04