Before revision:  Moreover, we also present a proof-of-concept implementation of our approach, demonstrate its validity and applicability by executing SPARQL queries on top of leading Graph stores ( Neo4J, Sparksee, and Apache TinkerGraph ) and compare their performances with RDF stores (Openlink Virtuoso, 4Store , and JenaTDB).
After revision:  Moreover, we also present a proof-of-concept implementation of our approach, demonstrate its validity and applicability by executing SPARQL queries on top of the leading graph stores Neo4J, Sparksee, and Apache TinkerGraph ) and compare their performances with RDF stores (Openlink Virtuoso, 4Store , and JenaTDB).