@article{ref1,
title="Differential sex learning in early childhood",
journal="Journal of asthma research",
year="1974",
author="Ferdman, J.",
volume="11",
number="4",
pages="151-158",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0021-9134",
doi="",
url="http://dx.doi.org/"
}