Till Mossakowski, Reinhard Moratz. Qualitative reasoning about relative direction of oriented points. Artificial Intelligence, 180-181:34-45, 2012. [doi]
@article{MossakowskiM12,
title = {Qualitative reasoning about relative direction of oriented points},
author = {Till Mossakowski and Reinhard Moratz},
year = {2012},
doi = {10.1016/j.artint.2011.10.003},
url = {http://dx.doi.org/10.1016/j.artint.2011.10.003},
researchr = {https://researchr.org/publication/MossakowskiM12},
cites = {0},
citedby = {0},
journal = {Artificial Intelligence},
volume = {180-181},
pages = {34-45},
}