@article {DBLP:journals/ai/SkiadopoulosK04,
	title = {Composing cardinal direction relations},
	journal = {Artif. Intell.},
	volume = {152},
	number = {2},
	year = {2004},
	pages = {143{\textendash}171},
	doi = {10.1016/S0004-3702(03)00137-1},
	url = {https://doi.org/10.1016/S0004-3702(03)00137-1},
	author = {Spiros Skiadopoulos and Manolis Koubarakis}
}
