CIKM'04 - IR-1 (Information Retrieval): Information Retrieval Models Simple BM25 Extension to Multiple Weighted Fields Stephen Robertson Hugo Zaragoza Michael Taylor Scoring Missing Terms in Information Retrieval Tasks Egidio Terra Charles L. A. Clarke Unified Utility Maximization Framework for Resource Selection Luo Si Jamie Callan Return to CIKM'04 Sessions ©2005 Association for Computing Machinery