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Riel, Henrik, Camilla Rams Rathleff, Pernille Møller Kalstrup, Niels Kragh Madsen, Elena Selmar Pedersen, Louise Bilenberg Pape-Haugaard, và Morten Villumsen. "Comparison between Mother, ActiGraph WGT3X-BT, and a Hand Tally for Measuring Steps At Various Walking Speeds Under Controlled Conditions." PeerJ 2016.

Riel, Henrik, et al. "Comparison between Mother, ActiGraph WGT3X-BT, and a Hand Tally for Measuring Steps At Various Walking Speeds Under Controlled Conditions." PeerJ 2016.