1. Subject analysis and search strategies–has the searcher become the bottleneck in the search process?;Nijhof;World Pat Inf,2007
2. The five laws of library science;Ranganathan,1967
3. Online searching: use of classificatory structures, School of Information Science and Policy, SUNY at Albany, USA, Iyer, H. XP000646150.
4. Applications of a subset-generating algorithm to base enumeration, knapsack and minimal covering problems;Stojmenovic,1988
5. Term-weighting approaches in automatic text retrieval;Salton,1988