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and VITTORIO GIANNINI WIND Telecomunicazioni S.p.A ________________________________________________________________________ In this paper we consider methods for automatic query expansion from top retrieved documents (i.e., retrieval feedback) which make use of various functions for scoring expansion terms within Rocchio's classical reweighting scheme. An analytical comparison shows that the retrieval performance of methods based on distinct term-scoring functions is comparable on the wholedoi:10.1145/568727.568728 fatcat:5ptoxedt5nhh7lwv4hux7w7qdy