@incollection{khnel1987earthly,
  address = {Rom, Freiburg, Wien},
  author = {Kühnel, Bianca},
  interhash = {38bd01c4e3efe118b0148096db16a6c0},
  intrahash = {c103959cb000f2ce8c5dfdb41dd8186e},
  pages = {34-38, 138-167, 174-177, 220-265, 275-279},
  series = {Römische Quartalschrift für christliche Altertumskunde und Kirchengeschichte. Supplementheft 42},
  title = {From the Earthly to the Heavenly Jerusalem. Representation of the Holy City in Christian Art of the First Millennium},
  year = 1987
}

@incollection{rahel2008papst,
  address = {Leipzig},
  author = {Oesterle, Jenny Rahel},
  booktitle = {Transkulturelle Komparatistik. Beiträge zu einer Globalgeschichte der Vormoderne},
  editor = {Drews, Wolfram and Oesterle, Jenny Rahel},
  interhash = {c654c61e535f20dad496b81a4331e944},
  intrahash = {a3523298ee1d31b14e4544cfc075edb3},
  pages = {57-72},
  title = {Papst – Kalif – König. Vergleiche sakraler Herrschaftsformen im Spiegel islamischer und christlicher Quellen des Mittelalters und moderner Forschung},
  year = 2008
}

@article{LILLEY,
  author = {Lilley, Keith D.},
  interhash = {7088a42aaeb17846a8738a00760f6bf4},
  intrahash = {b1b776a37e62aca4aa9a1c74f5d19793},
  journal = {Transactions of the Institute of British Geographers},
  pages = {296-313},
  title = {Cities of God? Medieval urban forms and their Christian symbolism},
  volume = 29,
  year = 2004
}