@article{ref1,
title="Medical problems of wearing a coalminer's helmet",
journal="British journal of industrial medicine",
year="1964",
author="Fernandez, R. H.",
volume="21",
number="",
pages="158-161",
abstract="Abstract unavailable.",
language="",
issn="0007-1072",
doi="",
url="http://dx.doi.org/"
}