1. Ullberg, S., Acta Radiol. Suppl., 118, 1 (1954).
2. Liss, R. H., Yesair, D. W., Watts, G. P., Cotton, F. A., and Kensler, C. J., The Pharmacologist, 10, 154 (1968).
3. Liss, R. H., Cotton, F. A., and Kensler, C. J., J. Cell. Biol., 43, 81 (1969).
4. Liss, R. H., Chadwick, M., and Platz, B. B., J. Cell. Biol., 55, 157a (1972).
5. Wiley, W. C., and Hendec, C. F., IRE Trans. Nuc. Sci., NS-9, 103 (1962).