@article{ref1,
title="An unusual foreign body in the rectum--a baseball: report of a case",
journal="Diseases of the colon and rectum",
year="1977",
author="McDonald, M. P. and Rosenthal, D.",
volume="20",
number="1",
pages="56-57",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0012-3706",
doi="",
url="http://dx.doi.org/"
}