S. Tahaghoghi, J. Thom, und H. Williams. TREC, Volume 500-251 von NIST Special Publication, National Institute of Standards and Technology (NIST), (2002)
S. Tahaghoghi, J. Thom, und H. Williams. ADC '01: Proceedings of the 12th Australasian database conference, Seite 138--144. Washington, DC, USA, IEEE Computer Society, (2001)