@article{ref1,
title="Modus tollens, the holism of Duhem-Quine and the social sciences",
journal="Dados",
year="2001",
author="De Freitas, R.S. and Collares, A.C.M.",
volume="44",
number="2",
pages="397-426",
abstract="<p>[Abstract unavailable]</p><p>Language: pt</p>",
language="pt",
issn="0011-5258",
doi="10.1590/s0011-52582001000200006",
url="http://dx.doi.org/10.1590/s0011-52582001000200006"
}