@article{ref1,
title="Effect of moderate carbon-monoxide exposure on fetal development",
journal="Lancet",
year="1972",
author="Astrup, P. and Olsen, H. M. and Trolle, D. and Kjeldsen, K.",
volume="2",
number="7789",
pages="1220-1222",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0140-6736",
doi="",
url="http://dx.doi.org/"
}