@article{ref1,
title="The effectiveness and safety of methadone maintenance",
journal="Addiction",
year="1996",
author="Ward, J. and Mattick, R. P. and Hall, W. and Darke, S.",
volume="91",
number="11",
pages="1727-1729",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0965-2140",
doi="",
url="http://dx.doi.org/"
}