@Book{dobyns2011falscher,
  author = {Dobyns, Jay and Johnson-Shelton, Nils and Rometsch, Martin},
  title  = {Falscher Engel: Mein Höllentrip als Undercover-Agent bei den Hells Angels},

  year   = {2011},
  number = {},
  url    = {},

  const  = {\ text}
}
@Article{montaner2003taxonomy,
  author = {Montaner, Miquel and López, Beatriz and de la Rosa, Josep Lluís},
  title  = {A Taxonomy of Recommender Agents on the Internet},
  journal = {Artificial Intelligence Review},
  year   = {2003},
  number = {4},
  url    = {http://dx.doi.org/10.1023/A%3A1022850703159},
  doi = {10.1023/A:1022850703159},
  const  = {\ text}
}
@Inproceedings{yu2003searching,
  author = {Yu, Bin and Singh, Munindar P.},
  title  = {Searching social networks},

  year   = {2003},
  number = {},
  url    = {http://doi.acm.org/10.1145/860575.860587},
  doi = {10.1145/860575.860587},
  const  = {\ text}
}
@Inproceedings{MobasheretalCHI2001,
  author = {Parent, S. and Mobasher, B. and Lytinen, S.},
  title  = {An Adaptive Agent for Web Exploration Based of Concept Hierarchies},

  year   = {2001},
  number = {},
  url    = {citeseer.nj.nec.com/443168.html},

  const  = {\ text}
}
@Article{steels98theOrigins,
  author = {Steels, L.},
  title  = {The Origins of Ontologies and Communication Conventions in Multi-Agent Systems},
  journal = {Autonomous Agents and Multi-Agent Systems},
  year   = {1998},
  number = {2},
  url    = {http://www.isrl.uiuc.edu/~amag/langev/paper/steels98theOrigins.html},

  const  = {\ text}
}