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Influenza || Genetic Approaches to Attenuation of Influenza A Viruses for ManB. R. Murphy, L. J. Markoff, R. M. Chanock, Susan B. Spring, H. F. Maassab, A. P. Kendal, Nancy J. Cox, M. M. Levine, R. G. Douglas Jr., R. F. Betts, R. B. Couch and T. R. Cate Jr. · Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences · 1980