GeoTriples: Transforming geospatial data into RDF graphs using R2RML and RML mappings. - Kostis Kyzirakos; Dimitrianos Savva; Ioannis Vlachopoulos; Alexandros Vasileiou 003; Nikolaos Karalis; Manolis Koubarakis; Stefan Manegold (J. Web Semant., 2018)