@article{ref1,
title="Femoral neck fractures in elderly patients with extensive osteoporosis",
journal="Wiadomosci Lekarskie",
year="1975",
author="Witwicki, T. and Dulowski, W. and Gorecki, A.",
volume="28",
number="22",
pages="1845-1851",
abstract="<p>[Abstract unavailable]</p><p>Language: pl</p>",
language="pl",
issn="0043-5147",
doi="",
url="http://dx.doi.org/"
}