@article{ref1,
title="The so-called Blue Cross during the German occupation",
journal="Przeglad Lekarski",
year="1970",
author="Ryn, Z.",
volume="26",
number="1",
pages="66-74",
abstract="<p>[Abstract unavailable]</p><p>Language: pl</p>",
language="pl",
issn="0033-2240",
doi="",
url="http://dx.doi.org/"
}