@Phdthesis{peters2009folksonomies,
  author = {Peters, Isabella},
  title  = {Folksonomies in Wissensrepräsentation und Information Retrieval},

  year   = {2009},
  number = {},
  url    = {},

  const  = {\ text}
}
@Article{stock2008folksonomies,
  author = {Peters, Isabella and Stock, Wolfgang G.},
  title  = {Folksonomies in Wissensrepräsentation und Information Retrieval},
  journal = {Information - Wissenschaft und Praxis},
  year   = {2008},
  number = {2},
  url    = {http://www.phil-fak.uni-duesseldorf.de/infowiss/mitarbeiter/wissenschaftliche-mitarbeiter-hilfskraefte/isabella-peters/012-folksonomies-in-wissensrepraesentation-und-information-retrieval/},

  const  = {\ text}
}