@techreport{publication-8467,
	author={Kietz, J{\"o}rg-Uwe and Scharrenbach, Thomas and Fischer, Lorenz and Nguyen, M K and Bernstein, Abraham},
	number={IFI-2013.07},
	title={TEF-SPARQL: The DDIS query-language for time annotated event and fact Triple-Streams},
	version=1,
	year=2013,
}