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Ballestra, L.: ¬L'¬indicizzazione semantica al tempo del web (2008)
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Alessandri, S.: Classificare la letteratura : la classe 800 nelle edizioni della DDC (2002)
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Negrini, G.: Principi filosofici per classificare : una teoria per la scienza (2003)
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Marchitelli, A.; Piazzini, T.: OPAC, SOPAC e social networking : cataloghi di biblioteca 2.0? (2008)
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