@article{ref1,
title="The role of converging lines on the perception of vertical lines: a Ponzo illusion variant",
journal="Acta psychologica",
year="1977",
author="Schiffman, H. R. and Thompson, J. G.",
volume="41",
number="6",
pages="461-466",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0001-6918",
doi="",
url="http://dx.doi.org/"
}