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B. R. Cho, Experimental Dual Infections of Chickens with Infectious Bursal and Marek's Disease Agents I. Preliminary Observation on the Effect of Infectious Bursal Agent on Marek's Disease, Avian Diseases, Vol. 14, No. 4 (Nov., 1970), pp. 665-675
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B. R. Cho (1970) studied this question.
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