1. Schaffer, L. F., and Schmidt, C. E., Advances in Virus Research, 6, edit. by Smith, K. M., and Lauffer, M. A., 159 (Academic Press, New York, 1959).
2. Taylor, J., and Graham, A. F., Virology, 6, 488 (1958).
3. Taniguchi, T., Virology, 22, 245 (1964).
4. Lowry, O. H., Rosebrough, N. J., Farr, A. L., and Randall, R. J., J. Biol. Chem., 193, 265 (1951).