@article{ref1,
title="Genetic and Environmental Influences on Aggression in 4- to 7-Year-Old Twins",
journal="Aggressive behavior",
year="1987",
author="Ghodsian-Carpey, Jilla and Baker, Laura A.",
volume="13",
number="4",
pages="173-186",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0096-140X",
doi="",
url="http://dx.doi.org/"
}