@INPROCEEDINGS{HawkingCT98,
    BOOKTITLE	= {Proceedings of {TREC}-7},
    MONTH 	= {November},
    YEAR 	= {1998},
    AUTHOR =	 {David Hawking and Nick Craswell and Paul
                  Thistlewaite},
    TITLE =	 {{ACSys} {TREC-7} Experiments},
    pages =	 {299--312},
    note =	 {NIST special publication 500-242,
              \url{http://david-hawking.net/pubs/hawking_trec98.pdf}
             },
}