@article{ref1,
title="The risky road to Mars--response",
journal="Science",
year="2013",
author="Zeitlin, Cary",
volume="341",
number="6150",
pages="1062-1062",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0036-8075",
doi="10.1126/science.341.6150.1062-b",
url="http://dx.doi.org/10.1126/science.341.6150.1062-b"
}