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A revised system of influenza virus nomenclature : A report of the WHO study group on classification Chanock, R. H.; Cockburn, W. C.; Davenport, Fred M.; Dowdle, W. R.; de St. Groth, S. Fazekas; Fukumi, H.; Kilbourne, E. D.; Schild, G. C.; Schulman, J. L.; Sohier, R. (Elsevier, 1972-03)