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Sieverts, E.G.; Hofstede, M.; Haak, P.H.; Nieuwenhuysen, P.; Scheepsma, G.M.A.; Veeger, L.; Vis, G.C.: Software for information storage and retrieval tested, evaluated and compared : Pt. 2: Classical retrieval systems (1991)
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Nieuwenhuysen, P.: Computerised storage and retrieval of structured text information : CDS/ISIS version 2.3 (1991)
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