@Article{halle:2009,
  author = {Halle, Axel},
  title  = {Urheberrecht und Open Access},
  journal = {Erziehungswissenschaften},
  year   = {2009},
  number = {38},
  url    = {},

  const  = {\ text}
}
@Article{Halle:2005,
  author = {Halle, Axel and Sepp, Wolf-Dieter},
  title  = {Wissenschaft braucht Informationsfreiheit},
  journal = {publik. Kasseler Hochschulzeitung},
  year   = {2005},
  number = {5},
  url    = {https://kobra.bibliothek.uni-kassel.de/handle/urn:nbn:de:hebis:34-20050712200},

  const  = {\ text}
}