1. Friend, C., Patuleia, M. C., & DeHarven, E., Nat. Cancer Inst. Monograph, 22, 505 (1966).
2. Friend, C., Scher, W., & Rossi, G. B., in The Biology of Large RNA Viruses (edit. by Barry, R. D., and Mahy, B. W. J.) (Academic Press, London and New York, 1970).
3. Friend, C., Scher, W., Holland, J. G., & Sato, T., Proc. US Nat. Acad. Sci., 68, 378 (1971).
4. Till, J. E., & McCulloch, E. A., Radiation Res., 14, 213 (1961).
5. Nowell, P. C., & Hungerford, D. A., Science, 132, 1497 (1960).