@inproceedings{maierp2009ijas,
  author = {Patrick, Maier and Marcus, T\"{o}nnis and Klinker, Gudrun},
  title = {{Augmented Reality for teaching spatial relations}},
  booktitle = {{CD-ROM Proceedings from the Conference of the International Journal of Arts and Sciences}},
  year = {2009},
  note = {ISSN: 1943-6114}
}