@article{ref1,
title="Tangible line graphs: an experimental investigation of three formats using capsule paper",
journal="Human factors",
year="1987",
author="Aldrich, F. K. and Parkin, A. J.",
volume="29",
number="3",
pages="301-309",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0018-7208",
doi="",
url="http://dx.doi.org/"
}