@article{ref1,
title="Measurement of feelings using visual analogue scales",
journal="Proceedings of the Royal Society of Medicine",
year="1969",
author="Aitken, R. C.",
volume="62",
number="10",
pages="989-993",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0035-9157",
doi="",
url="http://dx.doi.org/"
}