542,855 ORIGIN The orgin of pandemic influenza viruses : Proceedings of the International Workshop on the Molecular Biology and Ecology of Influenza Virus held in Peking, China, November 10-12, 1982 / ed. by W[illiam] G[raeme] Laver. - New York ; Amsterdam ; Oxford : Elsevier, [1983]. -XIII, [3], 309 s. : II., wykr. ; 24 cm ISBN 0-444-00811-X