@article {DBLP:journals/tkde/SkiadopoulosSSK07,
	title = {A Family of Directional Relation Models for Extended Objects},
	journal = {IEEE Trans. Knowl. Data Eng.},
	volume = {19},
	number = {8},
	year = {2007},
	pages = {1116{\textendash}1130},
	doi = {10.1109/TKDE.2007.1046},
	url = {https://doi.org/10.1109/TKDE.2007.1046},
	author = {Spiros Skiadopoulos and Nikos Sarkas and Timos K. Sellis and Manolis Koubarakis}
}
