@article{ref1,
title="Describing the unobserved: methodological challenges in empirical studies on human trafficking",
journal="International migration",
year="2005",
author="Tyldum, G. and Brunovskis, A.",
volume="43",
number="1-2",
pages="17-34",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0020-7985",
doi="10.1111/j.0020-7985.2005.00310.x",
url="http://dx.doi.org/10.1111/j.0020-7985.2005.00310.x"
}