@article{ref1,
title="Learning by doing",
journal="Nederlands Tijdschrift voor Geneeskunde",
year="1977",
author="Sluiter, H. J.",
volume="121",
number="52",
pages="2065-2068",
abstract="<p>[Abstract unavailable]</p><p>Language: nl</p>",
language="nl",
issn="0028-2162",
doi="",
url="http://dx.doi.org/"
}