@inbook {DBLP:reference/gis/Skiadopoulos17,
	title = {Directional Relations},
	booktitle = {Encyclopedia of GIS.},
	year = {2017},
	pages = {476{\textendash}482},
	doi = {10.1007/978-3-319-17885-1_1539},
	url = {https://doi.org/10.1007/978-3-319-17885-1_1539},
	author = {Spiros Skiadopoulos}
}
@conference {DBLP:conf/mdm/PoulisSLG13,
	title = {Distance-Based k\^m-Anonymization of Trajectory Data},
	booktitle = {2013 IEEE 14th International Conference on Mobile Data Management, Milan, Italy, June 3-6, 2013 - Volume 2},
	year = {2013},
	pages = {57{\textendash}62},
	doi = {10.1109/MDM.2013.66},
	url = {https://doi.org/10.1109/MDM.2013.66},
	author = {Giorgos Poulis and Spiros Skiadopoulos and Grigorios Loukides and Aris Gkoulalas-Divanis}
}
