1. Anderson, T., Grist, N. R., Landsman, J. B., Laidlaw, S. I. A., and Weir, I. B. L., An epidemic of influenza due to virus B, Br. Med. J. 1:7–11 (1953).
2. Andrewes, C. H., Laidlaw, P. P., and Smith, W., Influenza: Observations on the antibody content of human sera, Br. J. Exp. Pathol. 16:566–582 (1935).
3. Assaad, F., Cockburn, W. C., and Sundaresan, T. K., Use of excess mortality from respiratory diseases in the study of influenza, Bull. WHO 49:219–233 (1973).
4. Baron, S., and Isaacs, A., Absence of interferon in lungs from fatal cases of pneumonia, Br. Med. J. 1:18–20 (1962).
5. Beare, A. S., Methods of obtaining viruses suitable for live influenza vaccines and their potential efficacy in man, in: Proceedings of the Symposium on Live Influenza Vaccine, pp. 21–29, Yugoslav Academy of Sciences and Arts, Zagreb, 1971.