Query Expansion/Reduction and its Impact on Retrieval Effectiveness. - X. Allan Lu; Robert B. Keefer (TREC, 1994)

Boolean System Revisited: Its Performance and its Behavior. - X. Allan Lu; John D. Holt; David J. Miller (TREC, 1995)

Ad Hoc Experiments Using EUREKA. - X. Allan Lu; Maen Ayoub; Jianhua Dong (TREC, 1996)

Query processing in TREC-6. - Ashwin G. Rao; X. Allan Lu; Ed Meier; Salahuddin Ahmed; Daniel Pliske (Inf. Process. Manag., 2000)