@article{ref1,
title="Health problems and urbanization",
journal="Przeglad Epidemiologiczny",
year="1966",
author="Bakács, T.",
volume="20",
number="3",
pages="229-237",
abstract="<p>[Abstract unavailable]</p><p>Language: pl</p>",
language="pl",
issn="0033-2100",
doi="",
url="http://dx.doi.org/"
}