{"title": "The elementary theory of the symmetrical optical instrument", "key": "/works/OL10480813W", "authors": [{"type": {"key": "/type/author_role"}, "author": {"key": "/authors/OL2172375A"}}], "type": {"key": "/type/work"}, "latest_revision": 2, "revision": 2, "created": {"type": "/type/datetime", "value": "2009-12-11T03:02:27.173649"}, "last_modified": {"type": "/type/datetime", "value": "2025-11-09T02:49:47.169049"}}