1. Brenner, S., and Horne, R. W., Biochim. Biophys. Acta, 34, 103 (1959).
2. Franklin, R. E., Klug, A., and Holmes, K. C., Ciba Found. Symp. Nature of Viruses, 39 (Churchill, London, 1957).
3. Horne, R. W., and Waterson, A. P., J. Mol. Biol., 2, 75 (1960).
4. Crane, H. R., Sci. Monthly, 70, 376 (1950).
5. Pinteric, L., Fenje, P., and Almeida, J. D., Virology, 20, 208 (1963).