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Laegreid, J.A.: SIFT: a Norwegian information retrieval system (1993)
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Casale, M.: Full text retrieval for the Web (1996)
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Sieverts, E.G.; Hofstede, M.; Groeniger, B.O.: Software for information storage and retrieval tested, evaluated and compared : pt.4: indexing and full-text retrieval programs (1992)
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