@article{ref1,
title="Heart injuries. Observations of patients at the Institute of Surgery in Gdańsk",
journal="Polski Tygodnik Lekarski",
year="1972",
author="Jonas, Z. and Krajka, K.",
volume="27",
number="23",
pages="876-878",
abstract="<p>[Abstract unavailable]</p><p>Language: pl</p>",
language="pl",
issn="0032-3756",
doi="",
url="http://dx.doi.org/"
}