@article{mccallum2007topic,
  author = {McCallum, A. and Wang, X. and Corrada-Emmanuel, A.},
  title = {Topic and role discovery in social networks with experiments on enron and academic email},
  journal = {Journal of Artificial Intelligence Research},
  year = {2007},
  volume = {30},
  pages = {249--272},
  url = {http://scholar.google.de/scholar.bib?q=info:GVi_TXpyWz8J:scholar.google.com/&output=citation&hl=de&ct=citation&cd=0}
}