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SELECT page_title
  FROM page, revision, comment LEFT JOIN externallinks
                                 ON el_from = page_id
                                AND el_to_domain_index = 'https://info.d-nb.'
                                AND el_to_path LIKE '/gnd/%' WHERE page_namespace = 0
   AND page_id = rev_page
   AND rev_comment_id = comment_id
   AND comment_text = 'GND vorhanden'
   AND el_from IS NULL

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