http://general-terms.thesaurus.ekt.gr/vocabhttp://general-terms.thesaurus.ekt.gr/vocab?tema=11678classification http://general-terms.thesaurus.ekt.gr/vocab?tema=11678 automatic classification NT http://general-terms.thesaurus.ekt.gr/vocab?tema=11678 hierarchical classification NT http://general-terms.thesaurus.ekt.gr/vocab?tema=11678 faceted classification NT http://general-terms.thesaurus.ekt.gr/vocab?tema=11678 organisation of information BT