B. J. Jansen, A. Spink, J. Bateman, and T. Saracevic, Real life information retrieval: a study of user queries on the Web, ACM SIGIR Forum, vol.32, issue.1, pp.5-17, 1998.
DOI : 10.1145/281250.281253

J. Kamps, M. Marx, M. De-rijke, and B. Sigurbjörnsson, Structured queries in XML retrieval, Proceedings of the 14th ACM international conference on Information and knowledge management , CIKM '05, pp.4-11, 2005.
DOI : 10.1145/1099554.1099559

G. Kazai and A. Trotman, Users' perspectives on the usefulness of structure for XML information retrieval, International Conference on the Theory of Information Retrieval (ICTIR'07), pp.247-260, 2007.

M. Sanderson, Ambiguous queries, Proceedings of the 31st annual international ACM SIGIR conference on Research and development in information retrieval, SIGIR '08, pp.499-506, 2008.
DOI : 10.1145/1390334.1390420

E. Agichtein, E. Brill, and S. T. Dumais, Improving web search ranking by incorporating user behavior information, Proceedings of the 29th annual international ACM SIGIR conference on Research and development in information retrieval , SIGIR '06, pp.19-26, 2006.
DOI : 10.1145/1148170.1148177

S. M. Kirsch, Social information retrieval, 2005.

J. Diederich and T. Iofciu, Finding communities of practice from user profiles based on folksonomies, Workshop on Building Technology Enhanced Learning solutions for Communities of Practice (TEL- CoPs06), 2006.

S. Xu, S. Bao, B. Fei, Z. Su, and Y. Yu, Exploring folksonomy for personalized search, Proceedings of the 31st annual international ACM SIGIR conference on Research and development in information retrieval, SIGIR '08, pp.155-162, 2008.
DOI : 10.1145/1390334.1390363

Y. Cai and Q. Li, Personalized search by tag-based user profile and resource profile in collaborative tagging systems, Proceedings of the 19th ACM international conference on Information and knowledge management, CIKM '10, pp.969-978, 2010.
DOI : 10.1145/1871437.1871561

D. Vallet, I. Cantador, and J. M. Jose, Personalizing Web Search with Folksonomy-Based User and Document Profiles, European Conference on Information Retrieval (ECIR'10), pp.420-431, 2010.
DOI : 10.1007/978-3-642-12275-0_37

A. Kashyap, R. Amini, and V. Hristidis, SonetRank, Proceedings of the 21st ACM international conference on Information and knowledge management, CIKM '12, pp.2045-2049, 2012.
DOI : 10.1145/2396761.2398569

C. Au-yeung, N. Gibbins, and N. Shadbolt, A study of user profile generation from folksonomies, Workshop on Social Web and Knowledge Management, 2008.

M. Szomszor, H. Alani, I. Cantador, K. O. Hara, and N. Shadbolt, Semantic Modelling of User Interests Based on Cross-Folksonomy Analysis, International Semantic Web Conference (ISWC'08), pp.632-648, 2008.
DOI : 10.1016/0010-0285(91)90016-H

S. Robertson and H. Zaragoza, The Probabilistic Relevance Framework: BM25 and Beyond, Foundations and Trends?? in Information Retrieval, vol.3, issue.4, pp.333-389, 2009.
DOI : 10.1561/1500000019

S. Robertson, H. Zaragoza, and M. Taylor, Simple BM25 extension to multiple weighted fields, Proceedings of the Thirteenth ACM conference on Information and knowledge management , CIKM '04, pp.42-49, 2004.
DOI : 10.1145/1031171.1031181

S. Robertson, S. Walker, M. Hancock-beaulieu, M. Gatford, and A. Payne, Okapi at trec'4, Text REtrieval Conference (TREC'4), ser. TREC-4, pp.73-96, 1996.

K. S. Jones, S. Walker, and S. Robertson, A probabilistic model of information retrieval: development and comparative experiments, Information Processing & Management, vol.36, issue.6, pp.809-840, 2000.
DOI : 10.1016/S0306-4573(00)00016-9

C. D. Manning, P. Raghavan, and H. Schutze, Introduction to Information Retrieval, 2008.
DOI : 10.1017/CBO9780511809071

H. Zaragoza, N. Craswell, M. Taylor, S. Saria, and S. Robertson, Microsoft cambridge at TREC 13: Web and hard tracks, 2004.