@article{abel/crossSystemUM/SocialWeb/UMUAI/2011,
  author    = {Fabian Abel and Eelco Herder and Geert-Jan Houben and Nicola Henze and Daniel Krause},
  title     = {Cross-system User Modeling and Personalization on the Social Web},
  journal   = {User Modeling and User-Adapted Interaction (UMUAI), Special Issue on Personalization in Social Web Systems},
  year      = {2011},
  pages     = {1-42}
}