@conference {DBLP:conf/edbt/ZervakisTSSS16,
	title = {Towards Publish/Subscribe Functionality on Graphs},
	booktitle = {Proceedings of the Workshops of the EDBT/ICDT 2016 Joint Conference, EDBT/ICDT Workshops 2016, Bordeaux, France, March 15, 2016.},
	year = {2016},
	url = {http://ceur-ws.org/Vol-1558/paper13.pdf},
	author = {Lefteris Zervakis and Christos Tryfonopoulos and Vinay Setty and Stephan Seufert and Spiros Skiadopoulos}
}
@conference {DBLP:conf/stdbm/KoubarakisS99,
	title = {Tractable Query Answering in Indefinite Constraint Databases: Basic Results and Applications to Querying Spatiotemporal Information},
	booktitle = {Spatio-Temporal Database Management, International Workshop STDBM{\textquoteright}99, Edinburgh, Scotland, September 10-11, 1999, Proceedings},
	year = {1999},
	pages = {204{\textendash}223},
	doi = {10.1007/3-540-48344-6_12},
	url = {https://doi.org/10.1007/3-540-48344-6_12},
	author = {Manolis Koubarakis and Spiros Skiadopoulos}
}
