L. Elizabeth, How a Search Engine Works, Director of Center for Natural Language Processing Professor, 2005.

G. Salton, A. Wong, and Y. C. , A vector space model for automatic indexing, Communications of the ACM, vol.18, issue.11, pp.613-6230, 1975.
DOI : 10.1145/361219.361220

A. Mohammed, C. Razek, M. Frasson, and R. Kaltenbach-korfhage, A Context-Based Information Agent for Supporting Intelligent Distance Learning Environments, 1993.

G. Nagypal, Improving Information Retrieval Effectiveness by Using Domain Knowledge Stored in Ontologies, LNCS, vol.3762, pp.780-789, 2005.
DOI : 10.1007/11575863_98

S. Gallora, Fuzzy Ontology and Information Access on the web Content Distance and Morphology Approach in Information Retrieval, 2003.

J. Xu and W. B. Croft, Improving the effectiveness of information retrieval with local context analysis, ACM Transactions on Information Systems, vol.18, issue.1, 2008.
DOI : 10.1145/333135.333138

Y. Liao, A weight-based approach to information retrieval and relevance feedback, Expert Systems with Applications, vol.35, issue.1-2, 2007.
DOI : 10.1016/j.eswa.2007.06.032

N. O. Rubens, The Application of Fuzzy Logic to the Construction of the ranking function of Information retrieval Systems, Computer Modeling and New Technologies, vol.10, issue.1, pp.20-27, 2006.