@conference {DBLP:conf/ssd/SkiadopoulosK01,
	title = {Composing Cardinal Direction Relations},
	booktitle = {Advances in Spatial and Temporal Databases, 7th International Symposium, SSTD 2001, Redondo Beach, CA, USA, July 12-15, 2001, Proceedings},
	year = {2001},
	pages = {299{\textendash}320},
	doi = {10.1007/3-540-47724-1_16},
	url = {https://doi.org/10.1007/3-540-47724-1_16},
	author = {Spiros Skiadopoulos and Manolis Koubarakis}
}
