Xiang Tong ChengXiang Zhai Natasa Milic-Frayling David A. Evans OCR Correction and Query Expansion for Retrieval on OCR Data -- CLARIT TREC-5 Confusion Track Report. 1996 TREC http://trec.nist.gov/pubs/trec5/papers/CLARIT-Confusion.ps.gz db/conf/trec/trec1996.html#TongZME96a