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Ng JY, Ntoumanis N, Thøgersen-Ntoumani C, Deci EL, Ryan RM, Duda JL, Williams GC.Ng JY, et al.Perspect Psychol Sci. 2012 Jul;7(4):325-40. doi: 10.1177/1745691612447309.Perspect Psychol Sci. 2012.PMID: 26168470