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Perrig-Chiello, Pasqualina; Perrig, Walter J.; Uebelbacher, Andreas; Staehelin, Hannes (2006). Physical and psychological resources of functional autonomy in old age. Psychology, health & medicine, 11(4), pp. 470-482. Abingdon, UK: Routledge, Taylor & Francis Group 10.1080/13548500600726633
