1. Klein, G., Ann. Rev. Microbiol., 20, 223 (1966).
2. Essex, M., in Viruses, Evolution, and Cancer (edit. by Kurstak, E., and Maromorosch, K.), 513–548 (Academic Press,
3. Old, L. J., Boyse, E. A., and Stockert, E., Nature, 201, 777 (1964).
4. Lillv, F., and Steeves, R., Broch. Biofle. Acta, 355, 105 (1975).
5. Ceglowski, W. S., and Friedman, H., J. Immun., 101, 594 (1968).