Matthew Perry Prateek Jain 0001 Amit P. Sheth SPARQL-ST: Extending SPARQL to Support Spatiotemporal Queries. 61-86 2011 Geospatial Semantics and the Semantic Web https://doi.org/10.1007/978-1-4419-9446-2_3 conf/swb/2011geo db/conf/swb/geo2011.html#PerryJS11