1. Anon (1986). Annual report of the Division of Virology, IVRI Mukteswar, UP, India.
2. Bandyopadhyay, S. K., Gajendragad, M. R., Dhal, N. K., Gupta, A. R., &Yadav, M. P. (1984).Indian Journal of Animal Science,55, 961–964.
3. Kitching, R. P., Hammond, J. M. &Black, D. N. (1986).Journal of General Virology,67, 139–148.
4. Pandey, R. &Singh, I. P. (1972).Acta Virologica,16, 41–46.
5. Puranchand, Rao, V. D. P. Garg, S. K., &Singh, I. P. (1985).British Veterinary Journal,141, 124–128.