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Schneider, Rainer; Grüner, Mauritz; Heiland, Alexandra; Keller, Martina; Kujanová, Zuzana; Peper, Martin; Riegl, Maximilian; Schmidt, Stefan; Volz, Petra; Walach, Harald (2006). Effects of expectation and caffeine on arousal, well-being, and reaction time. International journal of behavioral medicine, 13(4), pp. 330-9. New York, N.Y.: Springer 10.1207/s15327558ijbm1304_8