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2. The Oxford dictionary of philosophy;Blackburn,1994
3. Placebos prove so powerful even the experts are surprised;Blakeslee;New York Times,1998
4. Cancer quackery: what can you do about it?;Brown;Nursing,1975
5. Effect of dietary fibre on stools and transit-times, and its role in the causation of disease;Burkitt;Lancet,1972