Downie, A. W., Vincent, L. S., Meiklejohn, G., Ratnakannan, N. R., Rao, A. R., Krishnan, G. N. V., & Kempe, C. H. (1961). Studies on the virus content of mouth washings in the acute phase of smallpox.

Downie, A. W., L. St Vincent, G. Meiklejohn, N. R. Ratnakannan, A. R. Rao, G. N. V. Krishnan, et C. H. Kempe. Studies On the Virus Content of Mouth Washings in the Acute Phase of Smallpox. 1961.

Downie, A. W., et al. Studies On the Virus Content of Mouth Washings in the Acute Phase of Smallpox. 1961.