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A new combination of multiple Information Retrieval approaches are proposed for book recommendation based on complex users' queries. We used different theoretical retrieval models: probabilistic as InL2 (Divergence From Randomness model) and language models and tested their interpolated combination. We considered the application of a graph based algorithm in a new retrieval approach to related document network comprised of social links. We called Directed Graph of Documents (DGD) a networkdoi:10.1109/wi-iat.2015.200 dblp:conf/webi/BenkoussasBO15 fatcat:2id5cguiovdo3imyznwf6baxn4