1. Dreyfus, M., Dodin, G., Bensaude, O., and Dubois, J. E., J. Am. Chem. Soc., 1975, 97, 2369.
2. Townsend, L. B. and Tipson, R. S.(Eds), `Nucleic acid chemistry’ (2 vols), WileyInterscience, 1978;
3. Eds Zorbach, W. W. and Tipson, R. S(Eds). S(Eds)., `Synthetic procedures in nucleic acid chemistry’ (2 vols), Wiley-Interscience, 1973.
4. Coburn, W. C., Thorpe, M. C., Montgomery, J. A., and Hewson, K., J. Org. Chem., 1965, 30, 1110.
5. Schumacher, M. and Günther, H., Chem. Ber., 1983, 116, 2001.