1. Ora Lassila, Ralph R. Swick (editors), “Resource Description Framework (RDF) Model and Syntax Specification”, 22 February 1999.
2. RFC2616, “Hypertext Transfer Protocol — HTTP/1.1”
3. L. Miller, A. Seaborne, A. Reggiori, “Three Implementations of SquishQL, a Simple RDF Query Language”, submitted to ISWC2002.
4. A. Seaborne, RDQL — RDF Data Query Language. RDQL grammar: http://www.hpl.hp.com/semweb/rdql-grammar.html
5. L. Miller, “Inkling: RDF query using SquishQL”, web page: http://swordfish.rdfweb.org/rdfquery/