1. J.B. Hobbs, 1985, Nucleosides, nucleotides and nucleic acids, Chapter 8 in The Chemistry of Natural Products (R.H. Thomson, ed.) Blackie, Glasgow.
2. M. Hoffer, R. Dushinsky, J.J. Fox and N. Yung, 1959, J. Am. Chem. Soc., 81, 4112
3. M. Hoffer, 1960, Chem. Ber., 93, 2777.
4. A.K. Bhattacharya, R.K. Ness and H.G. Fletcher Jr., 1963, J. Org. Chem., 28, 428.
5. Z. Kazimierczuk, H.B. Cottam, G.R. Revankar and R.K. Robins, 1984, J. Am. Chem. Soc., 106, 6379; see also Reference 7.