@article{ref1,
title="A longitudinal study of problem solving in adults",
journal="Journal of gerontology",
year="1974",
author="Arenberg, D.",
volume="29",
number="6",
pages="650-658",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0022-1422",
doi="",
url="http://dx.doi.org/"
}