1. The transitive reduction of a directed graph;Aho;SIAM J. Comput.,1972
2. Foundations of Databases;Abiteboul,1995
3. F. Alkhateeb, Querying RDF(S) with regular expressions, Ph.D. thesis, Université Joseph Fourier, Grenoble, France, 2008.
4. The expressive power of SPARQL;Angles,2008
5. J. Baget, RDF entailment as graph homomorphism, in: ISWC 2005, pp. 82–96.