@article{ref1,
title="Genetic and environmental influences on aggression in 4-year-old to 7-year-old twins",
journal="Aggressive behavior",
year="1987",
author="Ghodsiancarpey, J and Baker, LA",
volume="13",
number="4",
pages="173-186",
abstract="<p>[Abstract unavailable]</p>",
language="en",
issn="0096-140X",
doi="",
url="http://dx.doi.org/"
}