1. Gross, L. Oncogenic Viruses (Pergamon, New York, 1970).
2. Abelson, H. T. & Rabstein, L. S. Cancer Res. 30, 2213–2222 (1970).
3. Sklar, M. D., Shevach, E. M., Green, I. & Potter, M. Nature 253, 550–552 (1975).
4. Premkumar, E., Potter, M., Singer, P. A. & Sklar, M. D. Cell 6, 149–159 (1975).
5. Congdon, C. & Horenz, E. Am. J. Path. 30, 337–359 (1954).