L. K. Smithies, F. G. Emerson, S. M. Robertson, D. D. Ruedy, Two Different Type A Influenza Virus Infections in Turkeys in Wisconsin II. 1968 Outbreak, Avian Diseases, Vol. 13, No. 3 (Aug., 1969), pp. 606-610
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Smithies et al. (1969) studied this question.