@article{ref1,
title="Some records regarding absences and their causes in the Lincoln School of Teachers College",
journal="American journal of diseases of children (1911)",
year="1921",
author="Mason, Howard H.",
volume="22",
number="5",
pages="500-507",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0099-0698",
doi="10.1001/archpedi.1921.04120050071010",
url="http://dx.doi.org/10.1001/archpedi.1921.04120050071010"
}