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Aelterman, N., Vansteenkiste, M., Van Keer, H., Van den Berghe, L., De Meyer, J., & Haerens, L. (2012). Students’ Objectively Measured Physical Activity Levels and Engagement as a Function of Between-Class and Between-Student Differences in Motivation Toward Physical Education, Journal of Sport and Exercise Psychology, 34(4), 457-480. Retrieved Mar 31, 2020, from