See "Exemplary documents: a foundation for information retrieval
design," by David C. Blair and Steven O. Kimbrough, Information
Processing and Management, vol. 38, no. 3, pages 363-379, 2002.
biofuel policy is a 'mistake', BBC, 2007-08-18.
switch a mistake, say researchers, The Guardian, 2007-08-17.
- Energy transitions past and future by Cutler Cleveland.
- New Zeeland, "7 Implications of Higher Oil Prices for the Primary Sectors".
- "Cooking Up More Uses for the Leftovers of Biofuel Production". As PDF.