http://general-terms.thesaurus.ekt.gr/vocabhttp://general-terms.thesaurus.ekt.gr/vocab?tema=11532precoordinate indexing http://general-terms.thesaurus.ekt.gr/vocab?tema=11532 subject analysis BT http://general-terms.thesaurus.ekt.gr/vocab?tema=11532 postcoordinate indexing RT http://general-terms.thesaurus.ekt.gr/vocab?tema=11532 subject indexing BT