@article{ref1,
title="Probability of causation",
journal="Progress in clinical and biological research",
year="1986",
author="Nygaard, O. F.",
volume="208",
number="",
pages="85-88",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0361-7742",
doi="",
url="http://dx.doi.org/"
}