D. Abberley, S. Renals, G. Cook, и A. Robinson. TREC, том 500-240 из NIST Special Publication, стр. 747-752. National Institute of Standards and Technology (NIST), (1997)
D. Abberley, S. Renals, D. Ellis, и A. Robinson. TREC, том 500-246 из NIST Special Publication, National Institute of Standards and Technology (NIST), (1999)
D. Abberley, S. Renals, G. Cook, и A. Robinson. TREC, том 500-242 из NIST Special Publication, стр. 128-137. National Institute of Standards and Technology (NIST), (1998)