@article{ref1,
title="Problems of medicine during the German occupation. Preface",
journal="Przeglad Lekarski",
year="1970",
author="Bogusz, J.",
volume="26",
number="1",
pages="6-17",
abstract="<p>[Abstract unavailable]</p><p>Language: pl</p>",
language="pl",
issn="0033-2240",
doi="",
url="http://dx.doi.org/"
}