@article{ref1,
title="The causes of absence in a boys' school",
journal="American journal of diseases of children (1911)",
year="1923",
author="Sanford, C. H.",
volume="25",
number="4",
pages="297-301",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0099-0698",
doi="10.1001/archpedi.1923.01920040042004",
url="http://dx.doi.org/10.1001/archpedi.1923.01920040042004"
}