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D. H. Ley, R. Yamamoto, A. A. Bickford, The Pathogenesis of Infectious Bursal Disease: Serologic, Histopathologic, and Clinical Chemical Observations, Avian Diseases, Vol. 27, No. 4 (Oct. - Dec., 1983), pp. 1060-1085
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Ley et al. (1983) studied this question.
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