| web | Justin Gillis | New York Times | 2010-05-15 | |
| web | Der Spiegel | 2010-05-13 | ||
| web | New York Times | 2010-05-13 | ||
| web | Jeremy Hsu | LiveScience | 2010-05-12 | |
| web | Juliet Eilperin | Washington Post | 2010-05-05 | |
| web | Seth Borenstein | Associated Press | 2010-05-05 | |
| web | Politico | 2010-05-05 |