@article{ref1,
title="Parametrizing age, period, and cohort effects: an application to United States delinquency rates, 1964-1973",
journal="Sociological methodology",
year="1978",
author="Pullum, Thomas W.",
volume="9",
number="",
pages="116-140",
abstract="[Abstract unavailable]  <p>Language: en</p>",
language="en",
issn="0081-1750",
doi="",
url="http://dx.doi.org/"
}