Bahle, D., Williams, H.E., Zobel, J.,
"Efficient phrase querying with an auxiliary index",
Proceedings of SIGIR 2002, the Twenty-Fifth Annual International ACM SIGIR Conference on Research and Development in Information Retrieval, August 2002, Tampere, Finland, ACM SIGIR, pp. 215-221.
220 ;;Quote: use nextword index for phrase queries; 3x faster at 3% extra space
217 ;;Quote: removing commonest stopwords from queries reduces search time by 60% on average, 3x on longer queries
217+;;Quote: a nextword index allows efficient processing of stopwords in phrase queries