Stephen Robertson Papers on DiSC'04 Simple BM25 Extension to Multiple Weighted Fields Parsimonious Language Models for Information Retrieval Publications Note: Links lead to the DBLP on the Web. Stephen Robertson Stephen Robertson: On Event Spaces and Probabilistic Models in Information Retrieval. Inf. Retr. 8 (2): 319-329 (2005) Stephen Robertson: Process and Outcome: On the Evaluation of IR Systems in the Age of Interaction, GUIs and Multimedia. MIRA 1999 ©2005 Association for Computing Machinery