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“This book is organized in 6 chapters (Introduction, Classical retrieval models, Feature-based ranking, Feature-based query expansion, Query-dependent feature weighting, Model learning), two appendices (Data sets and Evaluation metrics) and a comprehensive bibliography. … The book is recommended for an advanced master’s or PhD-level course in information retrieval, being also a valuable reference for the researchers with professional interests in this domain.” (Mirel Cosulschi, Zentralblatt MATH, Vol. 1235, 2012)