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2. R. H. Thomson, Naturally Occurring Quinones, 2nd ed., Academic Press, London-New York, 1971.
3. R. H. Thomson, Naturally Occurring Quinones, 3rd ed., Chapman & Hall, London-New York, 1987.
4. R. H. Thomson, Naturally Occurring Quinones, 4th ed., Blackie Academic & Professional, London-New York, 1997.
5. The Chemistry of Quinoid Compounds, Ed. S. Patai, J. Wiley and Sons, New York, 1974.