1. Diplock, A. T., Green, J., Edwin, E. E. & Bunyan, J. (1961). Tocopherol, ubiquinones and ubichromenols in yeasts and mushrooms. Nature, Lond., 189, 749–50.
2. Forbes, M., Zilliken, F., Roberts, G. & György, P. (1958). A new antioxidant from yeast. Isolation and chemical studies, J. Am. Chem. Soc., 80, 385–9.
3. Green, J., Price, S. A. & Gare, L. (1959). Tocopherols in microorganisms, Nature, Lond., 184, 1339.
4. Hughes, P. E. & Tove, S. B. (1982). Occurrence of α-tocopherolquinone and α-tocopherolquinol in microorganisms. J. Bacteriol., 151, 1397–402.
5. Leuenberger, H.G.W(1985). Microbiologically catalyzed reaction steps in the field of vitamin and carotenoid synthesis. In Biocatalysts in Organic Synthesis, eds. J.Tramper, M. C. Van der Plas & P. Linko. Elsevier, Amsterdam, pp. 99–118.