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Nigg, Claudio R.; Geller, Karly S.; Motl, Rob W.; Horwath, Caroline C.; Wertin, Kristin K.; Dishman, Rodney K. (2011). A research agenda to examine the efficacy and relevance of the Transtheoretical Model for physical activity behavior. Psychology of sport and exercise, 12(1), pp. 7-12. Elsevier Science 10.1016/j.psychsport.2010.04.004
