{"languages": [{"key": "/l/eng"}], "subtitle": "Perspectives and Open Problems", "last_modified": {"type": "/type/datetime", "value": "2008-04-29 13:35:46.87638"}, "publishers": ["Academic Pr"], "number_of_pages": 454, "isbn_13": ["9780121153502"], "isbn_10": ["0121153509"], "publish_date": "February 1981", "key": "/b/OL7325826M", "authors": [{"key": "/a/OL837824A"}], "title": "Formal Language Theory", "type": {"key": "/type/edition"}, "id": 9984059, "revision": 1}