1. Drescher, J., Hennessy, A. V., and Davenport, F. M., J. Immunol., 89, 794 (1962).
2. Miller, G. L., and Stanley, W. M., J. Exp. Med., 79, 185 (1944).
3. Miller, G. L., J. Exp. Med., 79, 173 (1944).
4. Min. Health and Welfare, Japanese Government, The Minimum Requirements for Influenza Virus Vaccines (1960).