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http://journals.cambridge.org/action/displayAbstract?aid=29007
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JOHANNES B.J. BUSSMANN,
JOKE H.M. TULEN,
EVA C.G. VAN HEREL
and HENK J. STAM
(1998).
Quantification of physical activities by means of ambulatory accelerometry: A validation study. Psychophysiology, 35
,
pp 488-496