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2. Director, Yale Arbovirus Research Unit. Personal communication. May, 1973.
3. Shope, R.E. and Downs, W.G. Personal communication. 1973.
4. Bishop, D.H.L. and Shope, R.E. In: Comprehensive Virology, Vol. 14, Chapter 1. H. Fraenkel-Conrat and R.R. Wagner, editors. Plenum Press, New York and London. 1979. p. 45.
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