Ellen M. Voorhees and Donna K. Harman, Editors, TREC - Experiment and Evaluation in Information Retrieval, The MIT Press, Cambridge, MA (2005) ISBN 0-262-22073-3, p. 462.

Gheorghe Muresan Ellen M. Voorhees and Donna K. Harman, Editors, TREC - Experiment and Evaluation in Information Retrieval, The MIT Press, Cambridge, MA (2005) ISBN 0-262-22073-3, p. 462. 285-287 2007 43 Inf. Process. Manage. 1 http://dx.doi.org/10.1016/j.ipm.2006.05.016 db/journals/ipm/ipm43.html#Muresan07