TY - JOUR T1 - An upperbound to the performance of ranked-output searching: Optimal weighting of query terms using a genetic algorithm JO - Journal of Documentation PY - 1996/12/01 AU - Robertson AM AU - Willett P ED - DO - DOI: 10.1108/eb026973 VL - 52 IS - 4 SP - 405 EP - 420 Y2 - 2024/12/26 ER -