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Riebe, Deborah; Garber, Carol Ewing; Rossi, Joseph S.; Greaney, Mary L.; Nigg, Claudio R.; Lees, Faith D.; Burbank, Patricia M.; Clark, Philip G. (2005). Physical Activity, Physical Function, and Stages of Change in Older Adults. American journal of health behavior, 29(1), pp. 70-80. PNG Publications and Scientific Research 10.5993/ajhb.29.1.6
