Tomek Strzalkowski Jose Perez Carballo Jussi Karlgren Anette Hulth Pasi Tapanainen Timo Lahtinen Natural Language Information Retrieval: TREC-8 Report. 1999 TREC http://trec.nist.gov/pubs/trec8/papers/ge8adhoc2.pdf db/conf/trec/trec1999.html#StrzalkowskiCKHTL99