{"created": {"type": "/type/datetime", "value": "2009-12-10T20:12:37.448698"}, "subjects": ["Input-output analysis", "Linear programming"], "latest_revision": 3, "key": "/works/OL7015186W", "title": "Optimization over Leontief substitution systems", "authors": [{"type": {"key": "/type/author_role"}, "author": {"key": "/authors/OL1963469A"}}], "type": {"key": "/type/work"}, "last_modified": {"type": "/type/datetime", "value": "2019-03-16T00:59:05.572264"}, "covers": [8442827], "revision": 3}