Shepard, E., Halsey, L. G., Hulston, C. J., Venables, M. C., White, C. R., Jeukendrup, A. E., & Wilson, R. (2008). Acceleration versus heart rate for estimating energy expenditure and speed during locomotion in animals: Tests with an easy model species, Homo sapiens. Zoology, 111(3), p. 231. doi:10.1016/j.zool.2007.07.011

Shepard, Emily, Lewis G. Halsey, Carl J. Hulston, Michelle C. Venables, Craig R. White, Asker E. Jeukendrup, and Rory Wilson. "Acceleration Versus Heart Rate for Estimating Energy Expenditure and Speed During Locomotion in Animals: Tests With an Easy Model Species, Homo Sapiens." Zoology 111, no. 3 (2008): 231.

Shepard, Emily, et al. "Acceleration Versus Heart Rate for Estimating Energy Expenditure and Speed During Locomotion in Animals: Tests With an Easy Model Species, Homo Sapiens." Zoology 111.3 (2008): 231.