| web | http://www.washingtonpost.com/business/economy/why-hasnt-cellulosic-ethanol-taken-over-like-it-was-supposed-to/2013/11/08/b25b0d2c-466a-11e3-a196-3544a03c2351_story.html |
| author | Steven Mufson |
| publication | Washington Post |
| date | 2013-11-08 |
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