@article{ref1,
title="Toxic substances and ecological cycles",
journal="Scientific American",
year="1967",
author="Woodwell, G. M.",
volume="216",
number="3",
pages="24-31",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0036-8733",
doi="",
url="http://dx.doi.org/"
}