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Mullen, S. P., Olson, E.A., Phillips, S.M., Wojciki, T.R., Mailey, E.L., Gothe N.P., Fanning, J.T., Kramer, A,F., & McAuley, E. (2011). Measuring enjoyment of physical activity in older adults: Invariance of the physical activity enjoyment scale (PACES) across groups and time. International Journal of Behavioral Nutrition and Physical Activity, 8(103), 1-9.