@article{ref1,
title="Bottleneck in human evolution and the Toba eruption",
journal="Science",
year="1993",
author="Rampino, M. R. and Self, S.",
volume="262",
number="5142",
pages="1955-1955",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0036-8075",
doi="",
url="http://dx.doi.org/"
}