1. Sternberg, G. M. (1892), cited by Boulter, E.A., in J. Hyg. (London) 55:502, 1957.
2. Fenner, F., The Biology of Animal Viruses. Vol. I., p. 149 Academic Press, New York, 1968.
3. Interactions between newcastle disease virus (NDV), antibody and cell
4. Joklik, W.K., Prog. Med. Virol., Vol. 7 p. 44 Karger, New York, 1965.
5. The interaction of newcastle disease virus and neutralizing antibody