@article{ref1,
title="Characteristics of 15-year-old boys who demonstrate various accomplishments or difficulties",
journal="Child development",
year="1965",
author="Clarke, H. H. and Olson, Ardis L.",
volume="36",
number="",
pages="559-567",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0009-3920",
doi="",
url="http://dx.doi.org/"
}