Ontop: Answering SPARQL queries over relational databases

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@article{Calvanese2017OntopAS, title={Ontop: Answering SPARQL queries over relational databases}, author={Diego Calvanese and Benjamin Cogrel and Sarah Komla-Ebri and Roman Kontchakov and Davide Lanti and Mart{\'i}n Rezk and Mariano Rodriguez-Muro and Guohui Xiao}, journal={Semantic Web}, year={2017}, volume={8}, pages={471-487} }