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Sparck Jones, K.; Jackson, D.M.: ¬The use of automatically obtained keyword classification for information retrieval (1970)
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Klinger, K.-H.: Automatische Inhaltserschließung einer Volltextdatenbank : Machbarkeitsstudie am Beispiel der FAZ (1994)
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Tsareva, P.V.: Algoritmy dlya raspoznavaniya pozitivnykh i negativnykh vkhozdenii deskriptorov v tekst i protsedura avtomaticheskoi klassifikatsii tekstov (1999)
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