1. SQUALL: a controlled natural language as expressive as SPARQL 1.1;Ferré,2013
2. SQUALL: a controlled natural language for querying and updating RDF graphs;Ferré,2012
3. Foundations of Semantic Web Technologies;Hitzler,2009
4. Semantics and complexity of SPARQL;Pérez,2006
5. /facet: a browser for heterogeneous semantic web repositories;Hildebrand,2006