@article{ref1,
title="Judging similarity among strings described by hierarchical trees",
journal="Acta psychologica",
year="1982",
author="Lopes, L. L. and Johnson, M. D.",
volume="51",
number="1",
pages="13-26",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0001-6918",
doi="",
url="http://dx.doi.org/"
}