{"first_publish_date": "1920", "last_modified": {"type": "/type/datetime", "value": "2020-08-11T09:27:36.262923"}, "title": "Periodic orbits", "created": {"type": "/type/datetime", "value": "2009-12-10T00:00:39.343731"}, "covers": [5637227], "lc_classifications": ["QB355 .M6"], "latest_revision": 5, "key": "/works/OL2588613W", "authors": [{"type": "/type/author_role", "author": {"key": "/authors/OL371239A"}}], "type": {"key": "/type/work"}, "subjects": ["Orbits"], "revision": 5}