@article{ref1,
title="Surveillance: present and future",
journal="MMWR: Morbidity and mortality weekly report",
year="1992",
author="Periquet, A. O.",
volume="41",
number="Suppl 1",
pages="15-21",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0149-2195",
doi="",
url="http://dx.doi.org/"
}