@article{algebraicpropertiesofqualitativespatio,
  title = {Algebraic Properties of Qualitative Spatio-Temporal Calculi},
  author = {Frank Dylla and Till Mossakowski and Thomas Schneider and Diedrich Wolter},
  year = {2013},
  eprint = {1305.7345},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1305.7345v2},
}