From David Dewulf, Mindfulness Workbook: Powerfully and mildly living in the present, by permission. See .
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Douglas Adams, The Hitchhiker’s Guide to the Galaxy (Pan Macmillan, 1979).
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Friedman, R. S. & Forster, J. (2001), «The effects of promotion and prevention cues on creativity», Journal of Personality and Social Psychology, 81, pp. 1001–13.
