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Ernst, E. , & Pittler, M.H. (1997). Alternative therapy bias. Nature , 385, 480.

Walach, H. , Rilling, C. , & Engelke, U. (2000). Bach-flower remedies are ineffective for test-anxiety: Results of a blinded, placebo-controlled, randomized trial. Forsch Komplementärmedizin, Klasse Naturheilkunde, 7, 29-58.