@article{ref1,
title="The socioeconomic determinants of migration and the level of aggregation",
journal="Southern economic journal",
year="1977",
author="Navratil, Frank J. and Doyle, Joseph J.",
volume="43",
number="4",
pages="1547-1559",
abstract="<p>[Abstract unavailable]</p>",
language="en",
issn="0038-4038",
doi="",
url="http://dx.doi.org/"
}