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              Cheung, W.-Y. et al. (2013), "Back to the Future: Nostalgia Increases Optimism", Personality and Social Psychology Bulletin, Vol. 39, No. 11, pp. 1484-1496.
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              Cheung, W.-Y. et al. (2013), "Back to the Future: Nostalgia Increases Optimism", Personality and Social Psychology Bulletin, Vol. 39, Nr. 11, S. 1484-1496.
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              Cheung, W.-Y., Wildschut, T., Sedikides, C., Hepper, E. G., Arndt, J., & Vingerhoets, J. J. M. (2013). Back to the fu- ture: Nostalgia increases optimism. Personality & So- cial Psychology Bulletin, 39, 1484-1496. doi:10.1177/ 0146167213499187
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              Cheung, W. Y., ., Sedikides, C., Hepper, E. G., Arndt, J., Vingerhoets, J. J. M. (2013). Back to the fu- ture: Nostalgia increases optimism. Personality and Social Psychology Bulletin, 39(11), pp. 1484-1496.
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