@article{ref1,
title="Differential vibration of the feet and trunk of humans",
journal="Proceedings of the Human Factors and Ergonomic Society annual meeting",
year="1976",
author="Entrekin, Robert and Suggs, C. W. and Abrams, C. F.",
volume="20",
number="3",
pages="61-65",
abstract="At vibrational frequencies below four or five Hz most subjects preferred that the footrest move in phase with and at the same amplitude as the seat. At higher frequencies most subjects preferred a stationary footrest.<p /><p>Language: en</p>",
language="en",
issn="2169-5067",
doi="10.1177/154193127602000304",
url="http://dx.doi.org/10.1177/154193127602000304"
}