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P. A. Rota, M. L. Hemphill, T. Whistler, H. L. Regnery, A. P. Kendal. "Antigenic and Genetic Characterization of the Haemagglutinins of Recent Cocirculating Strains of Influenza B Virus." Journal of General Virology 73.10 (1992) 2737-2742