Evangelos Kanoulas Keshi Dai Virgiliu Pavlu Stefan Savev Javed A. Aslam Northeastern University in TREC 2009 Million Query Track. 2009 TREC http://trec.nist.gov/pubs/trec18/papers/northeasternu.MQ.pdf conf/trec/2009 db/conf/trec/trec2009.html#KanoulasDPSA09