1. Anderson, N. G., Green, J. G., Barber, M. L., and Ladd, F. C. (1963), Anal. Biochem. 6, 153.
2. Balsiger, R. W., and Montgomery, J. A. (1960), J. Org. Chem. 25, 1573.
3. Bayly, R. J., and Evans, E. A. (1968), “Storage and Stability of Compounds Labelled with Radioisotopes, ” The Radiochemical Centre, Amersham, England.
4. Beaven, G. H., Holiday, E. R., and Johnson, E. A. (1955), in “The Nucleic Acids, ” Vol. I, Academic Press, New York, p. 502.
5. Blackburn, G. M., and Davies, R. J. H. (1965), Chem. Commun. 11, 215.