@article{ref1,
title="Measurement of rigidity in high school students",
journal="Psychological reports",
year="1960",
author="Braen, Bernard B. and Wallen, Norman E.",
volume="7",
number="1",
pages="11-17",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0033-2941",
doi="10.2466/pr0.1960.7.1.11",
url="http://dx.doi.org/10.2466/pr0.1960.7.1.11"
}