TY  - RPRT
TI  - The ninth text REtrieval conference (TREC-9) 
AU  - Voorhees, E M
AU  - Harman, D K
PY  - 2001
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - NIST SP 500-249
DO  - 10.6028/NIST.SP.500-249
ER  -