| web | John R. Schramskia,1, David K.... | PNAS | 2015-06-08 | |
| web | Post Carbon Institute | 2015-03-16 | ||
| web | Gail Tverberg | Oil Drum | 2012-03-16 | |
| web | Oil Drum | 2012-03-16 | ||
| web | 2012-03-16 | |||
| web | Rembrandt Koppelaar | Oil Drum | 2012-02-16 | |
| web | National Academy of Sciences | National Academies Press | 2010-01-01 | |
| web | Rear Admiral Hyman G. Rickover... | US Navy | 1957-05-14 |